{"title":"TeleVue Barlow Lenses","description":"\u003cp\u003eTeleVue Barlow lenses and Powermates multiply the focal length of your telescope, so each eyepiece gives more magnification for the Moon, planets and double stars. The classic Barlows come in 2x and 3x for 1.25\" and as the 2x BIG Barlow in 2\".\u003c\/p\u003e\u003cp\u003ePowermate image amplifiers in 2.5x and 5x (1.25\") and 2x and 4x (2\") use a four-element design that suits both high-power viewing and planetary imaging.\u003c\/p\u003e","products":[{"product_id":"tele-vue-2x-powermate-2-inch","title":"Tele Vue 2x Powermate - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eMagnification Factor: 2x\u003c\/li\u003e\n\u003cli\u003eBarrel Size: 2\"\u003c\/li\u003e\n\u003cli\u003eOptical Design: 4-element Telecentric Amplifier\u003c\/li\u003e\n\u003cli\u003eCoatings: Fully Multi-Coated\u003c\/li\u003e\n\u003cli\u003eFilter Threads: Yes (48mm \/ 2\")\u003c\/li\u003e\n\u003cli\u003eWeight: 1.20 lbs (544g)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eManual\/Software\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eBeyond the Barlow: High-Fidelity Planetary Amplification\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue 2x Powermate - 2\" is not a Barlow lens; it is a sophisticated 4-element telecentric amplifier designed to increase your telescope's magnification without the optical compromises inherent in traditional designs. This 2-inch model is the definitive choice for observers and imagers who require high-power views of the Moon and planets, delivering images that retain the full fidelity of the primary optics. It is engineered to be a transparent addition to your optical train, preserving sharpness, contrast, and field geometry.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe Powermate's Telecentric Optical Advantage\u003c\/h3\u003e\n\u003cp\u003eA standard Barlow lens works by diverging the light cone from your telescope's objective, which moves the exit pupil and can introduce spherical aberration, especially in fast telescopes. The Tele Vue Powermate's 4-element design corrects for this. It recaptures the diverging rays and re-collimates them, keeping the exit pupil in its original location and ensuring the light rays exit parallel to the optical axis.\u003c\/p\u003e\n\u003cp\u003eThis telecentric correction is what sets the Powermate apart. It means your eyepieces can operate as if they are looking directly at the telescope's objective, preserving their designed performance characteristics. The result is a uniformly sharp field, free of the edge-of-field astigmatism and color fringing that can soften views through a simple Barlow.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eFidelity Through High-Transmission Coatings\u003c\/h3\u003e\n\u003cp\u003eEvery air-to-glass surface in the 2x Powermate is fully multi-coated with Tele Vue's proprietary index-matched coatings. This meticulous process minimizes light loss from reflection and maximizes transmission across the visual spectrum. The practical benefit is a brighter, higher-contrast image than what typical Barlows can provide.\u003c\/p\u003e\n\u003cp\u003eOn a target like Jupiter, this translates to more subtle detail in the cloud bands and a more distinct Great Red Spot. The improved contrast makes it easier to discern low-contrast features, such as festoons and ovals, against the planet's bright disk. There is no false color or \"ghosting,\" just the pure signal from your telescope, amplified.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA Secure, Non-Marring Mechanical Interface\u003c\/h3\u003e\n\u003cp\u003eThe Powermate's mechanical construction is as robust as its optical design. The 2-inch barrel is machined from solid aluminum and features a chromed sleeve that resists wear and slides smoothly into your focuser. A captive brass clamp ring, tightened by a single oversized thumbscrew, provides a secure grip on your eyepieces or camera nosepiece.\u003c\/p\u003e\n\u003cp\u003eThis design prevents the common problem of marred barrels caused by simple set screws. It also ensures a perfectly centered alignment of the eyepiece with the Powermate's optics, which is critical for maintaining optical performance at high magnifications. This solid, repeatable connection gives you confidence that your expensive eyepieces and cameras are held safely.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eIntegrated 2-Inch Filter Threads\u003c\/h3\u003e\n\u003cp\u003eFor planetary observers, filters are essential tools for enhancing specific details. The 2x Powermate's barrel is threaded to accept standard 48mm (2-inch) filters. This allows you to attach a Moon filter, a color filter for enhancing planetary features, or even a light pollution filter directly to the Powermate.\u003c\/p\u003e\n\u003cp\u003ePlacing the filter before the eyepiece and Powermate optics is often preferable, as it minimizes any potential reflections that could occur between the filter and the eyepiece's field lens. It also simplifies your workflow, allowing you to leave a commonly used filter attached to the Powermate and switch eyepieces without having to re-thread the filter each time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe View from the Cassini Division\u003c\/h3\u003e\n\u003cp\u003eImagine your 10-inch SCT is aimed at Saturn on a night of steady seeing. With a 24mm wide-field eyepiece, you get a pleasing 83x view, but the rings are just a bright, flat oval. You insert the 2x Powermate, and the magnification jumps to 166x. The planet swells to fill more of the field, and the image remains perfectly sharp.\u003c\/p\u003e\n\u003cp\u003eThe first thing you notice is the clean, dark gap of the Cassini Division, now resolved as a distinct black line tracing the circumference of the rings. The subtle shading of the Crepe Ring inside the main rings becomes visible. With a moment of steady air, you can even pick out the faint banding on Saturn's globe itself. This is the Powermate's function: it delivers the magnification needed for fine detail without degrading the image your telescope worked so hard to focus.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eEngineered for High-Resolution Imaging\u003c\/h3\u003e\n\u003cp\u003eThe Powermate's telecentric design makes it an ideal amplifier for imaging. Because it produces parallel light rays, it is much more forgiving of camera sensor placement than a Barlow. This makes it a perfect match for planetary cameras, webcams, and DSLRs used in \"eyepiece projection\" mode.\u003c\/p\u003e\n\u003cp\u003eWith the optional Tele Vue PMT-2200 T-Ring Adapter, you can connect your camera body directly to the Powermate for a secure, threaded connection. This solid imaging train is essential for high-resolution lunar and planetary photography, eliminating the potential for flexure and ensuring your sensor remains perfectly orthogonal to the optical axis.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003ePowermate vs. Barlow: A Critical Distinction\u003c\/h3\u003e\n\u003cp\u003eChoosing the right magnification tool depends on your equipment and goals. The 2-inch 2x Powermate occupies a specific performance niche.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. Tele Vue 2x BIG Barlow:\u003c\/strong\u003e The BIG Barlow is an excellent visual accessory that provides a more affordable path to 2x amplification. However, the Powermate's telecentric correction provides a distinct advantage for imagers and for visual use in very fast (f\/4-f\/5) telescopes, where it better controls aberrations and maintains eyepiece performance. For critical planetary work, the Powermate is the superior optical tool.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. Tele Vue 4x Powermate:\u003c\/strong\u003e The 4x Powermate is a specialized tool for nights of exceptional seeing or for imagers using large pixels who need to achieve a specific image scale. The 2x Powermate is far more versatile, providing a magnification boost that is usable on average nights with a wider range of telescopes and eyepieces. The 2x is the workhorse of the Powermate family.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe primary trade-off for the Powermate's optical performance is its size, weight, and cost compared to a standard Barlow. At 1.20 lbs, it requires a robust focuser and may necessitate re-balancing your telescope. However, for those who refuse to compromise on image quality, this is a trade-off that delivers a clear, visible return at the eyepiece.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Powermate really better than a good Barlow lens?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor most visual use, the difference can be subtle, but for imaging and use with fast telescopes (f\/5 or lower), the Powermate's telecentric design provides a flatter, sharper field by not moving the exit pupil. It maintains the performance of your eyepieces more faithfully than a Barlow.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the 2\" Powermate with 1.25\" eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The 2\" 2x Powermate comes with a 1.25\" adapter that fits in its eyepiece end. This allows you to use your 1.25\" eyepieces while taking advantage of the Powermate's optical quality.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the 2x Powermate work for deep-sky observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile designed for high-power planetary viewing, it can be used to increase magnification on smaller deep-sky objects like planetary nebulae (e.g., the Ring Nebula, M57) or to split tight double stars. However, it will dim the image, as any magnification increase does.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I attach a camera to the 2x Powermate?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou will need the Tele Vue PMT-2200 T-Ring Adapter. This accessory threads onto the top of the Powermate, providing standard T-threads for connecting a DSLR-specific T-ring or a planetary imaging camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 2\" Powermate heavy? Will my focuser handle it?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 2\" 2x Powermate weighs 1.20 lbs (544g). While most modern 2-inch Crayford or rack-and-pinion focusers can handle the weight, it is a significant load. Ensure your focuser's tension is properly adjusted to prevent slipping, and be prepared to re-balance your telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel #\u003c\/td\u003e\n\u003ctd\u003ePMT-2200\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnification Factor\u003c\/td\u003e\n\u003ctd\u003e2x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003e4-element telecentric amplifier\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Coatings\u003c\/td\u003e\n\u003ctd\u003eFully Multi-Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Threads\u003c\/td\u003e\n\u003ctd\u003e48mm (for 2\" filters)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e1.20 lbs \/ 544 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeight\u003c\/td\u003e\n\u003ctd\u003e4.8\" \/ 122 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Barrel Diameter\u003c\/td\u003e\n\u003ctd\u003e2.7\" \/ 68.6 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTele Vue 2x Powermate - 2\"\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2\" to 1.25\" Eyepiece Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTop Dust Cap\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBottom Dust Cap\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_2x_Powermate_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/tele-vue-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eTele Vue 5-Year Limited Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":51223879844125,"sku":"TV-PMT-2200","price":543.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_2x_Powermate_2in_1.jpg?v=1777515018"},{"product_id":"tele-vue-2-5x-powermate-1-25-inch","title":"Tele Vue 2.5x Powermate - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eMagnification: 2.5x\u003c\/li\u003e\n\u003cli\u003eBarrel Size: 1.25\"\u003c\/li\u003e\n\u003cli\u003eOptical Design: 4-Element Pupillary Corrector\u003c\/li\u003e\n\u003cli\u003eCompatibility: Visual and Photographic Use\u003c\/li\u003e\n\u003cli\u003eFilter Threads: Yes (1.25\")\u003c\/li\u003e\n\u003cli\u003eWeight: 0.45 lbs (204 g)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eManual\/Software\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eMore Than a Barlow: The Tele Vue 2.5x Powermate\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue 2.5x Powermate is a compact, professional-grade 1.25\" magnification amplifier designed to increase the power of your eyepieces and imaging cameras without the optical compromises of a standard Barlow lens. It uses a proprietary 4-element design to deliver sharp, high-contrast, and color-correct views, making it an essential tool for high-resolution planetary, lunar, and solar observation and imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe Powermate's 4-Element Pupillary Corrector Design\u003c\/h3\u003e\n\u003cp\u003eUnlike a simple Barlow lens which moves the exit pupil and can introduce aberrations, the Tele Vue Powermate employs a sophisticated four-element optical system. This design functions as a pupillary corrector, keeping the exit pupil of your eyepiece in its natural position. The result is a view that is sharp across the entire field, free from the vignetting and edge-of-field astigmatism that can affect complex, wide-field eyepieces when used with a standard Barlow.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eFully Multi-Coated Optics for Maximum Contrast\u003c\/h3\u003e\n\u003cp\u003eEvery air-to-glass surface in the 2.5x Powermate receives Tele Vue's stringent multi-layer anti-reflection coatings. This meticulous process ensures maximum light transmission, minimizing internal reflections and ghosting. For the observer, this translates directly into higher contrast at the eyepiece, revealing subtle surface details on Jupiter's cloud bands or delicate rilles on the Moon that might otherwise be lost to scattered light.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eConstant Magnification and Preserved Eye Relief\u003c\/h3\u003e\n\u003cp\u003eA key advantage of the Powermate design is its consistent performance. The 2.5x magnification factor remains constant regardless of the eyepiece used, and it does not significantly shorten the eye relief of your favorite long-eye-relief eyepieces. This means you can enjoy the comfort of your Delos or Panoptic eyepieces while operating at higher power, a significant benefit for eyeglass wearers or anyone who dislikes crowding the eyepiece.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eTelecentric Performance for Specialized Filters\u003c\/h3\u003e\n\u003cp\u003eThe Powermate's optical system is telecentric, meaning it outputs light rays that are parallel to the optical axis. This is a critical feature for users of highly sensitive solar filters, particularly Hydrogen-alpha etalons, which require parallel light for their interference filters to function correctly. Using a Powermate ensures the filter's bandpass is not shifted, delivering a uniform, high-contrast solar image across the entire field of view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA High-Performance Photographic Amplifier\u003c\/h3\u003e\n\u003cp\u003eFor planetary imagers, the 2.5x Powermate acts as a high-performance telephoto lens for your camera sensor. It produces a flatter field than a typical Barlow, ensuring sharpness from the center to the edge of the chip. This is the tool you reach for when your telescope's native focal length isn't long enough to achieve the critical image scale needed to resolve craterlets near the lunar terminator or capture the Cassini Division in Saturn's rings with a high-speed planetary camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eVersatile Mechanical and Threaded Design\u003c\/h3\u003e\n\u003cp\u003eThe Powermate is built for flexibility in the field. The 1.25\" barrel is threaded to accept standard 1.25\" filters, allowing you to add a moon filter or planetary color filter without unscrewing your eyepiece. For imagers, the top of the Powermate is threaded to accept the Tele Vue PTR-1250 T-Ring adapter, enabling a secure, direct connection to a DSLR or dedicated astronomy camera for a rigid imaging train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe Right Tool for High-Magnification Observing\u003c\/h3\u003e\n\u003cp\u003eImagine your 8\" SCT on a night of steady seeing, with Jupiter well-placed. A 10mm eyepiece yields 200x, but the atmosphere can support more. Inserting the 2.5x Powermate brings the magnification to 500x. As your eye settles, the image snaps into focus. You can now clearly distinguish multiple belts and zones, trace the intricate festoons within them, and watch the tiny, sharp disks of the Galilean moons transit the planet's face. This is the jump in performance the Powermate is designed to deliver.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA Note on Limitations and System Matching\u003c\/h3\u003e\n\u003cp\u003eWhile optically powerful, the 2.5x Powermate adds weight and length to the optical train. On smaller mounts or telescopes with limited back-focus, achieving balance can be a consideration. Furthermore, its high magnification factor demands good atmospheric seeing; on turbulent nights, the Powermate will amplify the turbulence just as effectively as it amplifies the target. It is a high-performance tool that rewards patience and steady skies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eChoosing Your Tele Vue Magnification Amplifier\u003c\/h3\u003e\n\u003cp\u003eTele Vue offers several tools for increasing magnification, each with a specific purpose. Understanding the trade-offs helps you choose the right one for your observing style.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.5x Powermate vs. 2x Barlow:\u003c\/strong\u003e The standard 2x Barlow is an excellent, compact choice for general-purpose visual use. The 2.5x Powermate is the superior option when using premium, wide-field eyepieces, for imaging, or with specialized solar filters due to its advanced 4-element, telecentric design that better controls aberrations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.5x Powermate vs. 5x Powermate:\u003c\/strong\u003e The 2.5x is the versatile, all-around choice for most telescopes and seeing conditions. The 5x Powermate is a specialist's tool, designed primarily for high-resolution planetary imaging with large-aperture telescopes on nights of exceptional atmospheric stability. For most visual observers, the 5x model provides more magnification than conditions will typically allow.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs a Powermate better than a Barlow lens?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor most applications, yes. The Powermate's 4-element design corrects for aberrations that Barlows can introduce, especially with wide-field eyepieces. It also keeps light rays parallel, which is critical for use with Hydrogen-alpha solar filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the 2.5x Powermate for imaging?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The 2.5x Powermate is an excellent choice for high-resolution lunar and planetary imaging. It creates a flat, sharp field and provides the image scale needed for small sensors to capture fine detail.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the 2.5x Powermate work with my Nagler or Ethos eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it is an ideal match. The Powermate's pupillary-correcting design means it will not introduce the aberrations or vignetting that can occur when using complex, wide-field eyepieces with a standard Barlow lens.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat adapter do I need to connect a camera to the 2.5x Powermate?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou will need the Tele Vue PTR-1250 T-Ring Adapter. This adapter threads directly onto the top of the Powermate, and you then attach the appropriate T-Ring for your specific camera brand (e.g., Canon EOS, Nikon F).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this Powermate work in a 2\" focuser?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, you can use the 1.25\" Powermate in a 2\" focuser with a standard 2\" to 1.25\" adapter. However, it is designed for use with 1.25\" eyepieces and accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eTV-PMT-2513\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnification Factor\u003c\/td\u003e\n\u003ctd\u003e2.5x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003e4-element, pupillary-correcting\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eFully Multi-Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Threads\u003c\/td\u003e\n\u003ctd\u003e1.25\" (M28.5 x 0.6)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.45 lbs \/ 7.2 oz \/ 204 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e3.1\" \/ 79 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Barrel Diameter\u003c\/td\u003e\n\u003ctd\u003e1.6\" \/ 41 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTele Vue 2.5x Powermate - 1.25\"\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e1.25\" Dust Cap (Top)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e1.25\" Dust Cap (Bottom)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_2.5x_Powermate_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/tele-vue-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eTele Vue 5-Year Limited Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":51223879876893,"sku":"TV-PMT-2513","price":364.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_2.5x_Powermate_1.25in_1.jpg?v=1777515017"},{"product_id":"tele-vue-4x-powermate-2-inch","title":"Tele Vue 4x Powermate - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eMagnification Factor: 4x\u003c\/li\u003e\n\u003cli\u003eBarrel Size: 2\"\u003c\/li\u003e\n\u003cli\u003eOptical Design: 4-Element Pupillary Corrector\u003c\/li\u003e\n\u003cli\u003eCompatibility: 2\" and 1.25\" Eyepieces (with adapter)\u003c\/li\u003e\n\u003cli\u003ePrimary Use: High-Magnification Visual and Imaging\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eReach Deeper with the Tele Vue 4x Powermate\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eTele Vue 4x Powermate - 2\"\u003c\/strong\u003e is a professional-grade magnification amplifier, engineered to quadruple the power of your eyepieces or imaging camera without the optical compromises of a standard Barlow lens. It is the definitive choice for serious planetary observers and imagers seeking the highest levels of magnification while preserving the optical integrity of their telescope system. This is not just a Barlow; it is a sophisticated, four-element optical system designed for uncompromising performance.\u003c\/p\u003e\n\u003cp\u003eFor observers with fast Dobsonian reflectors or Schmidt-Cassegrains, the 4x Powermate delivers the extreme focal lengths necessary to resolve fine details on Jupiter's cloud belts, Cassini's Division in Saturn's rings, and subtle albedo features on Mars. It allows you to use your comfortable, long eye relief, low-power eyepieces for high-power observing, transforming them into planetary performers. The result is a level of magnification that is sharp, bright, and free of the aberrations that can plague simpler amplifier designs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe Powermate Optical Concept\u003c\/h3\u003e\n\u003cp\u003eUnlike a conventional Barlow lens, which diverges light rays, the Tele Vue 4x Powermate features a four-element, pupillary-correcting design. This sophisticated system re-collimates the light exiting the Powermate, making the rays parallel to the optical axis. This telecentric output is the key to its superior performance, especially with modern, wide-field eyepieces.\u003c\/p\u003e\n\u003cp\u003eThe practical benefit is that the Powermate does not alter the eyepiece's intended eye relief or introduce spherical aberration to the exit pupil. Your long eye relief 2\" eyepiece remains comfortable to use, and the field remains sharp from edge to edge. This is a critical distinction that sets the Powermate in a class of its own for high-power visual use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eTelecentric Performance for Imaging and Solar\u003c\/h3\u003e\n\u003cp\u003eThe telecentric output of the 4x Powermate is a significant advantage for specialized applications. For hydrogen-alpha solar observing with etalon-based filters, this parallel light path is essential. It ensures the filter's bandpass remains consistent across the entire field of view, preventing off-axis hot-spotting and delivering a uniform, high-contrast solar disk.\u003c\/p\u003e\n\u003cp\u003eFor planetary imagers, the telecentric design means the magnification factor remains constant regardless of the camera's distance from the top of the Powermate. This consistency simplifies achieving the correct image scale for optimal sampling with your specific camera sensor. It effectively turns your telescope into a longer focal ratio instrument without introducing the optical compromises of a traditional Barlow.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eHigh-Transmission Multi-Coated Optics\u003c\/h3\u003e\n\u003cp\u003eEvery air-to-glass surface in the 4x Powermate receives Tele Vue's proprietary multi-layer coatings. These advanced coatings are optimized for high transmission across the visual spectrum, ensuring that the magnified image is as bright and high-contrast as possible. This is not a system that dims the view; it simply enlarges it.\u003c\/p\u003e\n\u003cp\u003eMaximizing light throughput is critical when working at the high magnifications this unit provides. By minimizing reflections and internal scattering, the Powermate delivers a clean, crisp image with a dark background. This allows you to push your telescope to its theoretical limits on nights of good seeing, teasing out faint planetary details that would otherwise be lost in glare.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSecure, Non-Marring Connections\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eTele Vue 4x Powermate - 2\"\u003c\/strong\u003e is built for heavy-duty use with large 2\" eyepieces and imaging equipment. The chromed 2\" barrel provides a durable, smooth surface that slides easily into your focuser and resists wear. A captive setscrew ensures you cannot accidentally drop the screw in the dark.\u003c\/p\u003e\n\u003cp\u003eInside the eyepiece holder, a soft brass clamp ring provides a secure grip on your accessories without marring their barrels. Unlike a simple thumbscrew that digs into the barrel, this compression ring distributes pressure evenly, protecting your investment in premium eyepieces and cameras while ensuring a perfectly centered optical alignment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA High-Power Planetary Imaging Lens\u003c\/h3\u003e\n\u003cp\u003eThe optical section of the 4x Powermate can be unthreaded from its 2\" barrel, revealing a male thread. With the addition of a PMT-4201 T-Ring Adapter, you can connect a DSLR or astronomical camera directly to the Powermate optics. This converts the unit into a high-quality 4x teleconverter for planetary, lunar, or solar imaging.\u003c\/p\u003e\n\u003cp\u003eImagine using an 8\" SCT at its native 2000mm focal length. The 4x Powermate transforms it into an 8000mm (f\/40) planetary imaging instrument, perfectly scaled for capturing fine detail with modern high-speed video cameras. This versatility makes it a dual-purpose tool for both visual observers and dedicated astrophotographers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eExperiencing Jupiter at 4x\u003c\/h3\u003e\n\u003cp\u003eConsider an 8-inch, f\/10 Schmidt-Cassegrain telescope on a night of steady seeing. Inserting a 24mm wide-field eyepiece yields a modest 83x magnification. Now, add the 4x Powermate. The magnification jumps to 332x, a power level where Jupiter resolves from a bright disk into a detailed globe.\u003c\/p\u003e\n\u003cp\u003eAs your eye settles, the image snaps into focus. The two main equatorial belts are no longer simple stripes but complex zones with internal swirls and festoons. You can clearly distinguish the color difference between the North and South Equatorial Belts, and with patience, you might spot smaller ovals and barges within the zones. The Great Red Spot, if visible, appears as a distinct, salmon-colored oval, not just a hint of color. This is the power of the Powermate: it unlocks the full resolving potential of your telescope on the solar system's most challenging targets.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eChoosing Your Magnification: Powermate vs. Barlow\u003c\/h3\u003e\n\u003cp\u003eThe Tele Vue lineup offers several magnification options, and choosing the right one depends on your telescope and goals.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. 2x Powermate:\u003c\/strong\u003e The 2x is a versatile, all-around performer suitable for most telescopes. The 4x is a specialist's tool, intended for when you need the maximum practical magnification your telescope and seeing conditions will allow. It is the right choice when the 2x simply doesn't provide enough image scale for small planetary disks or tiny planetary nebulae.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. Tele Vue Barlows:\u003c\/strong\u003e A Tele Vue Barlow is an excellent choice for visual use and is more compact. However, the Powermate's telecentric design gives it a distinct advantage for imaging and for use with complex, multi-element eyepieces, where it maintains the designed optical performance without introducing aberrations. The Powermate is the more flexible and optically pure solution, especially at this high 4x factor.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eA genuine limitation of the 4x Powermate is its sensitivity to atmospheric seeing. A 4x magnification factor will also amplify any turbulence in the air. This tool requires steady skies to deliver its best performance, and on nights of poor seeing, a lower-power amplifier like a 2x model may provide a more pleasing view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs a 4x Powermate too much power for my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor planetary viewing, a good rule of thumb for maximum useful magnification is 50x to 60x per inch of aperture. A 4x Powermate is ideal for 8\" or larger telescopes on nights of good seeing. For smaller scopes, it may exceed the useful magnification limit unless used for imaging where short exposures can \"freeze\" the seeing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat's the difference between a Powermate and a Barlow lens?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA Barlow lens diverges light, which can change an eyepiece's eye relief and introduce aberrations. A Powermate is a 4-element telecentric amplifier that keeps light rays parallel, preserving the eyepiece's native performance and providing a sharper image, especially for imaging and with wide-field eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the 4x Powermate for deep-sky observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile possible, it's not its primary purpose. The 4x Powermate is designed for extreme high magnification on bright objects like the Moon and planets. For most deep-sky objects, which are faint and extended, you will want lower magnification to maintain a brighter image and a wider field of view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the 4x Powermate work with my 1.25\" eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The 2\" Powermate includes a 2\" to 1.25\" adapter, allowing you to use all of your 1.25\" eyepieces securely. The brass clamp ring on the adapter ensures your smaller eyepiece barrels will not be scratched.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I use the 4x Powermate for astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou will need the Tele Vue PMT-4201 T-Ring adapter. This adapter allows you to unthread the optical cell from the 2\" barrel and connect it directly to a camera-specific T-ring, creating a solid, threaded connection for high-magnification planetary imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the 4x Powermate require a lot of focuser in-travel or out-travel?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 4x Powermate is nearly \"parfocal,\" meaning it requires very little refocusing when inserted into the optical train. This makes it easy to switch between observing with and without it during a session without major focuser adjustments.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct SKU\u003c\/td\u003e\n\u003ctd\u003eTV-PMT-4201\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnification Factor\u003c\/td\u003e\n\u003ctd\u003e4x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003e4-Element Pupillary Corrector\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eFully Multi-Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e19.2 oz (1.20 lbs \/ 544 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeight\u003c\/td\u003e\n\u003ctd\u003e5.2\" (132 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Barrel Diameter\u003c\/td\u003e\n\u003ctd\u003e2.7\" (68.6 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEyepiece Holder\u003c\/td\u003e\n\u003ctd\u003eBrass Clamp Ring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Threads\u003c\/td\u003e\n\u003ctd\u003eYes (2\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTele Vue 4x Powermate - 2\"\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2\" to 1.25\" Eyepiece Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTop Dust Cap\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBottom Dust Cap\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_4x_Powermate_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/tele-vue-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eTele Vue 5-Year Limited Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":51223879909661,"sku":"TV-PMT-4201","price":554.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_4x_Powermate_2in_1.jpg?v=1777515018"},{"product_id":"tele-vue-5x-powermate-1-25-inch","title":"Tele Vue 5x Powermate - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eMagnification Factor: 5x\u003c\/li\u003e\n\u003cli\u003eBarrel Size: 1.25\"\u003c\/li\u003e\n\u003cli\u003eOptical Design: 4-Element Telecentric\u003c\/li\u003e\n\u003cli\u003eWeight: 0.40 lbs \/ 181g\u003c\/li\u003e\n\u003cli\u003eTotal Height: 3.1\" \/ 79mm\u003c\/li\u003e\n\u003cli\u003eT-Ring Adapter Ready: Yes (Model PTR-1250)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eManual\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eReach the Solar System's Most Elusive Details\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue 5x Powermate - 1.25\" is a high-magnification visual and imaging accessory that functions as a compact, four-element telecentric amplifier. It delivers a five-fold increase in magnification with optical performance that a standard Barlow lens cannot match, making it the definitive choice for serious planetary, lunar, and double-star observers who require maximum power and image fidelity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA Smarter Approach to High-Power Astronomy\u003c\/h3\u003e\n\u003cp\u003eA conventional Barlow lens works by diverging the light cone from the objective, which introduces optical aberrations, particularly with fast f\/ratio telescopes. The Powermate's innovative 4-element telecentric design functions differently. It re-images the focal plane with parallel exiting rays, which means the eyepiece performs as if it were simply viewing a much larger, longer focal length telescope.\u003c\/p\u003e\n\u003cp\u003eThis telecentric correction results in a view that is sharply focused across the entire field, free of the edge-of-field astigmatism and induced field curvature that can soften the image in a simple Barlow. For you, the observer, this means pinpoint stars to the edge of the field and a consistently sharp planetary disk, even in fast Newtonians or apochromatic refractors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eDesigned for Critical Planetary Imaging\u003c\/h3\u003e\n\u003cp\u003eThe 5x Powermate is an essential tool for high-resolution planetary imaging. Its telecentric output ensures that the focal plane is flat and the image scale remains constant, regardless of the camera's sensor position. This makes it a preferred choice over Barlows for achieving the large image scales needed to resolve fine details on Jupiter, Saturn, and Mars with modern CMOS cameras.\u003c\/p\u003e\n\u003cp\u003eThe optical housing is designed to unthread from the barrel, allowing direct connection to a camera via a dedicated Powermate T-Ring Adapter. This rigid, threaded connection eliminates any potential for flexure or tilt that can occur with standard nosepiece setups, preserving the alignment critical for capturing sharp, high-contrast images of subtle planetary features.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe Experience at 5x Magnification\u003c\/h3\u003e\n\u003cp\u003eThis level of magnification demands steady atmospheric seeing, but when conditions permit, the results are transformative. With a modest telescope like an 8-inch SCT and a 20mm Plössl eyepiece, the 5x Powermate yields 500x. On a good night, Jupiter's Galilean moons resolve from star-like points into distinct, tiny orbs. The Great Red Spot reveals its intricate, swirling texture, and you can trace the subtle festoons and eddies within the equatorial belts.\u003c\/p\u003e\n\u003cp\u003eOn Saturn, the Cassini Division becomes a sharp, black gap rather than a faint pencil line. You may even glimpse the much harder Encke Gap in the outer A ring. This is the Powermate's core function: it pushes your telescope to its absolute resolution limit, revealing details that are simply inaccessible at lower powers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eParfocal and Mechanically Sound\u003c\/h3\u003e\n\u003cp\u003eTele Vue has engineered the Powermate to be nearly parfocal. When you insert it into your diagonal, your eyepiece will require minimal refocusing. This practical feature makes it easy to switch between low-power finding views and high-power detailed views without losing your target.\u003c\/p\u003e\n\u003cp\u003eThe physical construction reflects Tele Vue's commitment to quality. The chromed barrel features a safety undercut to prevent it from accidentally slipping out of the focuser, while a non-marring brass clamp ring secures your eyepiece without scratching its barrel. This ensures a secure, perfectly centered optical train every time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe Limitation: Atmospheric Seeing\u003c\/h3\u003e\n\u003cp\u003eThe primary constraint for any high-power accessory is the Earth's atmosphere. At 5x magnification, even minor atmospheric turbulence will be amplified, causing the image to shimmer or \"boil.\" This is not a flaw in the Powermate; it is the reality of high-resolution observing. The 5x Powermate is a special-purpose tool, best reserved for those nights of excellent seeing when the air is steady and your telescope can deliver its best performance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eChoosing the Right Powermate\u003c\/h3\u003e\n\u003cp\u003eTele Vue offers a family of Powermates, and selecting the right one depends on your telescope and goals.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. 2.5x Powermate:\u003c\/strong\u003e The 2.5x is a more versatile, all-purpose choice that works well on average nights. The 5x is a specialist's tool, designed to achieve the largest possible image scale for imaging or for visual use on the very best nights with long focal length telescopes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. 4x Powermate (2\"):\u003c\/strong\u003e The 4x offers a similar magnification boost but in a 2-inch format, better suited for large, heavy 2-inch eyepieces. The 1.25\" 5x is lighter and designed for the smaller, shorter focal length eyepieces typically used for planetary viewing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs a 5x Powermate better than a 5x Barlow lens?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, optically it is. The Powermate's 4-element telecentric design corrects for aberrations that a simple 2-element Barlow lens cannot. This results in a sharper, flatter field of view, especially in fast telescopes, and it is a superior choice for planetary imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat's the best use for the 5x Powermate?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt excels at high-resolution planetary and lunar imaging, where you need to achieve a large image scale to resolve very fine details. Visually, it is used for splitting tight double stars and for planetary observation on nights of exceptionally steady atmospheric seeing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the 5x Powermate work with my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt will work with any telescope that has a 1.25\" focuser. However, it provides very high magnification. For a telescope with a long focal length like an SCT or Maksutov, you will need eyepieces with longer focal lengths (e.g., 20mm to 25mm) to achieve a usable magnification.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the image blurry when I use the 5x Powermate?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAt such high power, the image quality is almost always limited by atmospheric turbulence (\"seeing\"), not the optics. If the air is unsteady, the image will appear to shimmer or boil. The 5x Powermate is a specialized tool that requires calm atmospheric conditions to perform at its best.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I attach a camera to the 5x Powermate?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou need the Tele Vue Powermate T-Ring Adapter (model PTR-1250). You unscrew the chrome barrel from the black optical housing and thread the adapter in its place. This allows you to securely attach a DSLR or dedicated astronomy camera via its T-ring.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct SKU\u003c\/td\u003e\n\u003ctd\u003eTV-PMT-5126\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnification Factor\u003c\/td\u003e\n\u003ctd\u003e5x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003e4-element telecentric\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.40 lbs \/ 181 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeight (in focuser)\u003c\/td\u003e\n\u003ctd\u003e2.2\" \/ 56 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Height\u003c\/td\u003e\n\u003ctd\u003e3.1\" \/ 79 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Barrel Diameter\u003c\/td\u003e\n\u003ctd\u003e1.6\" \/ 41 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEyepiece Holder\u003c\/td\u003e\n\u003ctd\u003eBrass Clamp Ring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eT-Ring Adapter\u003c\/td\u003e\n\u003ctd\u003eTele Vue PTR-1250 (sold separately)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cimg class=\"DAV-img-box\" alt=\"Tele Vue 5x Powermate - 1.25 inch\" src=\"\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTele Vue 5x Powermate - 1.25\"\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cimg class=\"DAV-img-box\" alt=\"Tele Vue 1.25-inch Top Dust Cap\" src=\"\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTop Dust Cap\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cimg class=\"DAV-img-box\" alt=\"Tele Vue 1.25-inch Bottom Dust Cap\" src=\"\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBottom Dust Cap\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_5x_Powermate_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/tele-vue-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eTele Vue 5-Year Limited Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":51223879975197,"sku":"TV-PMT-5126","price":364.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_5x_Powermate_1.25in_1.jpg?v=1777515018"},{"product_id":"tele-vue-2x-barlow-1-25-inch","title":"Tele Vue 2x Barlow - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eMagnification Factor: 2x\u003c\/li\u003e\n\u003cli\u003eBarrel Size: 1.25\"\u003c\/li\u003e\n\u003cli\u003eOptical Design: 2-Element, Fully Multi-Coated\u003c\/li\u003e\n\u003cli\u003eEyepiece Holder: Brass Compression Ring\u003c\/li\u003e\n\u003cli\u003eFilter Threads: Yes (1.25\")\u003c\/li\u003e\n\u003cli\u003eWeight: 5 oz (142 g)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eDouble Your Magnification, Not Your Eyepiece Collection\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue 2x Barlow - 1.25\" is a foundational accessory designed to double the power of any 1.25\" eyepiece with exceptional optical quality. It effectively doubles the utility of your existing eyepiece set, providing a high-performance, cost-effective way to access higher magnifications for planetary, lunar, and double-star observing without compromising image integrity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA High-Contrast 2-Element Optical System\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the Tele Vue 2x Barlow is a two-element, fully multi-coated optical design. This is not just a simple magnifier. The lens group is engineered to be a seamless extension of your eyepiece, preserving the sharpness, contrast, and color fidelity of the original view, just at twice the magnification.\u003c\/p\u003e\n\u003cp\u003eThe high-transmission coatings on every air-to-glass surface ensure that scattering and reflections are minimized. This results in a darker background sky and allows subtle details on bright objects, like the Cassini Division in Saturn's rings or the delicate banding on Jupiter, to resolve with clarity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eParfocal Integration with Tele Vue Eyepieces\u003c\/h3\u003e\n\u003cp\u003eThis Barlow is designed to integrate smoothly into your observing workflow, especially if you use Tele Vue Plössl or Panoptic eyepieces. It is nearly parfocal, meaning you will need little to no refocusing when inserting or removing the Barlow. This is a significant practical advantage in the field.\u003c\/p\u003e\n\u003cp\u003eImagine you are observing Jupiter with a 25mm Plössl. When you add the 2x Barlow to get a closer look, the planet snaps back into focus with a minimal turn of the knob. This keeps your target centered and your attention on the view, not on the mechanics of the telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe Security of a Brass Compression Ring\u003c\/h3\u003e\n\u003cp\u003eMany simple Barlows use a basic thumbscrew that presses directly against your eyepiece barrel, causing scratches and dents over time. The Tele Vue 2x Barlow incorporates a non-marring brass compression ring. When you tighten the thumbscrew, this soft metal ring gently and uniformly tightens around the eyepiece.\u003c\/p\u003e\n\u003cp\u003eThis mechanism provides two key benefits. First, it protects your investment in quality eyepieces by preventing cosmetic damage. Second, it ensures a more secure and perfectly centered connection, which is critical for maintaining optical alignment at high power.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThoughtful Mechanical Design for Field Use\u003c\/h3\u003e\n\u003cp\u003eEvery mechanical detail is built for reliability. The main barrel features a safety undercut, a groove that catches the focuser's thumbscrew if it loosens unexpectedly. This simple feature can prevent the Barlow and your expensive eyepiece from falling to the ground on a cold, dark night.\u003c\/p\u003e\n\u003cp\u003eThe lens element itself is housed in a cell that can be unscrewed from the main barrel. This cell has standard 1.25\" filter threads, allowing you to attach a planetary or moon filter directly to the Barlow. This versatility lets you experiment with different optical configurations, including increasing the magnification factor by adding extension tubes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eObserving Jupiter's Great Red Spot\u003c\/h3\u003e\n\u003cp\u003eWith a 13mm Nagler eyepiece in an 8\" f\/10 SCT, you have 154x magnification, a good power for general planetary viewing. Now, insert the Tele Vue 2x Barlow. The magnification jumps to 308x, pushing the limits of atmospheric seeing but bringing Jupiter's disk to an impressive size.\u003c\/p\u003e\n\u003cp\u003eAs your eye settles, the view is not just larger, it remains sharp. The Great Red Spot, often a subtle salmon-colored oval, now shows hints of internal texture. You can more easily discern smaller, transient storms and the intricate whorls within the North and South Equatorial Belts. This is the difference a high-quality Barlow makes, transforming a good view into a detailed study.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA Foundational Tool for High-Resolution Observing\u003c\/h3\u003e\n\u003cp\u003eThe primary trade-off with any Barlow is the addition of more glass to the light path. While Tele Vue's design minimizes light loss and reflections, a single long-focal-length eyepiece will theoretically have slightly higher throughput. However, the Tele Vue 2x Barlow provides a level of versatility and optical performance that makes it an indispensable tool for nearly any observer.\u003c\/p\u003e\n\u003cp\u003eFor observers who want to get the most out of a curated set of high-quality eyepieces, this Barlow is the right choice. It provides access to the high-power realm required for serious planetary and double-star work without the cost and bulk of a dedicated set of short-focal-length eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eChoosing the Right Tele Vue Magnifier\u003c\/h3\u003e\n\u003cp\u003eTele Vue offers several magnification solutions. Understanding their design intent helps you choose the right one for your specific needs.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e2x Barlow:\u003c\/strong\u003e The classic choice for visual observing. It is lightweight, simple, and optimized to deliver high-contrast, high-magnification views with any eyepiece. Its primary purpose is to double the magnification for planetary, lunar, and double star observation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3x Barlow:\u003c\/strong\u003e Offers more power in the same compact form factor. This is an excellent choice for short-focal-length telescopes where achieving very high magnifications for planetary imaging or splitting tight double stars is the main goal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePowermate:\u003c\/strong\u003e A more complex 4-element design that acts as a pupil-correcting image amplifier. Powermates are specifically engineered to be telecentric, meaning they do not move the exit pupil or change the eye relief of the eyepiece. This makes them a superior choice for imaging and for use with long-focal-length eyepieces where a standard Barlow might introduce vignetting.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Tele Vue 2x Barlow work with any brand of eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it is compatible with any standard 1.25\" eyepiece. While it is parfocal with many Tele Vue eyepieces, it will perform exceptionally well optically with eyepieces from any manufacturer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat's the difference between a Barlow and a Powermate?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA Barlow is a diverging lens that increases magnification but can alter the eyepiece's eye relief and exit pupil position. A Powermate is a 4-element telecentric amplifier that increases magnification while keeping the eyepiece's optical properties intact, making it a better choice for imaging and long-focal-length eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use filters with this Barlow lens?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the bottom lens element cell has standard 1.25\" (M28.5 x 0.6) threads, allowing you to attach any standard 1.25\" filter directly to the Barlow.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I get more than 2x magnification from this Barlow?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou can increase the magnification by unscrewing the black barrel and adding a 1.25\" extension tube between the Barlow's lens element and the eyepiece. The farther the eyepiece is from the lens, the higher the magnification will be.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Tele Vue Barlow worth the price compared to cheaper models?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Tele Vue 2x Barlow uses high-quality glass, superior multi-coatings, and a non-marring compression ring. These features result in sharper, higher-contrast images and protect your eyepieces from damage, justifying the investment for serious observers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel #\u003c\/td\u003e\n\u003ctd\u003eBLW-2125\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnification Factor\u003c\/td\u003e\n\u003ctd\u003e2x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003e2-element, fully multi-coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEyepiece Holder\u003c\/td\u003e\n\u003ctd\u003eBrass compression ring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Threads\u003c\/td\u003e\n\u003ctd\u003e1.25\" (M28.5 x 0.6)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e5 oz (142 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e2.7\" (69 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTele Vue 2x Barlow - 1.25\"\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTop Dust Cap\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBottom Dust Cap\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_2x_Barlow_1.25-inch_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/tele-vue-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eTele Vue 5-Year Limited Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":51223880073501,"sku":"TV-BLW-2125","price":214.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_2x_Barlow_1.25in_1.jpg?v=1777515017"},{"product_id":"tele-vue-2x-big-barlow-2-inch","title":"Tele Vue 2x BIG Barlow - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eMagnification Factor: 2x\u003c\/li\u003e\n\u003cli\u003eBarrel Size: 2\" with 1.25\" Adapter\u003c\/li\u003e\n\u003cli\u003eOptical Design: 4-Element, Telecentric\u003c\/li\u003e\n\u003cli\u003eCoatings: Fully Multi-Coated\u003c\/li\u003e\n\u003cli\u003eFilter Threads: Yes (48mm for 2\" Filters)\u003c\/li\u003e\n\u003cli\u003eWeight: 0.75 lbs \/ 340 g\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eManual\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eDouble the Power, Not the Problems\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue 2x BIG Barlow - 2\" is an amplification lens engineered to double the magnification of your eyepieces without compromising the optical integrity of your telescope system. Designed for observers who use premium 2\" and 1.25\" eyepieces, this is not a simple two-element Barlow. It is a sophisticated four-element telecentric amplifier that delivers high-contrast, high-fidelity views for both visual observation and imaging.\u003c\/p\u003e\n\u003cp\u003eIts primary purpose is to increase magnification while preserving the eye relief of your favorite long focal length eyepieces and maintaining a flat, well-corrected field. For the planetary observer or high-resolution deep-sky enthusiast, the Big Barlow transforms a low-power eyepiece into a high-power planetary instrument with a single motion, often with little to no refocusing required.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA Smarter Optical Path for High Magnification\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the Big Barlow is a four-element, telecentric optical design. Unlike a traditional Barlow that diverges the light cone, this system keeps the exiting light rays parallel to the optical axis. This subtle but critical difference is what allows it to be nearly \"parfocal,\" meaning you will not have to substantially change focus when you insert it into the optical train.\u003c\/p\u003e\n\u003cp\u003eThis design also corrects for spherical aberration that can be introduced when using long focal-length eyepieces. The result is a sharper, higher-contrast image across the entire field of view. Stars remain tight pinpoints from the center to the edge, a performance characteristic that simpler Barlows often fail to achieve, especially in fast telescopes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eMaximum Light Throughput with Multi-Coatings\u003c\/h3\u003e\n\u003cp\u003eEvery air-to-glass surface in the Big Barlow is multi-coated with Tele Vue's proprietary high-transmission coatings. This ensures that the maximum amount of light from your telescope's objective reaches your eye or camera sensor. The practical effect is a brighter, higher-contrast image with minimized ghosting and internal reflections.\u003c\/p\u003e\n\u003cp\u003eWhen you are pushing your telescope to its magnification limits on a target like Jupiter, this increased contrast makes a real difference. Faint festoons in the cloud belts and subtle color variations in the zones become more perceptible because stray light has been effectively suppressed within the optical system.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSeamless Integration with Parfocal Performance\u003c\/h3\u003e\n\u003cp\u003eOne of the most practical benefits of the Big Barlow's design is its parfocal nature. You can switch between observing with an eyepiece alone and with the Big Barlow in place and require only a minimal tweak of the focuser. This is a significant workflow advantage in the field, especially during nights of good seeing when you want to quickly increase power to catch fleeting planetary detail.\u003c\/p\u003e\n\u003cp\u003eWith a 32mm Plössl, you can frame the entire Double Cluster in Perseus. Insert the Big Barlow, and without a major focus change, you are now observing the core of one of the clusters at twice the power, resolving individual star colors. This seamless transition from low-power finding to high-power observing is what sets this amplifier apart.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eVersatile Eyepiece Compatibility with the 1.25\" Adapter\u003c\/h3\u003e\n\u003cp\u003eThe Big Barlow is designed to be the only amplification lens you need. It includes a high-quality 2\" to 1.25\" adapter that features a non-marring brass clamp ring. This ensures your smaller, high-end eyepieces are held securely and perfectly centered in the optical path without scratching their barrels.\u003c\/p\u003e\n\u003cp\u003eThis versatility means you can use your entire eyepiece collection, from a massive 2\" wide-field eyepiece for deep-sky vistas to a small 1.25\" planetary eyepiece for lunar and planetary work. The robust build quality easily handles the weight and leverage of even the heaviest eyepieces in the Tele Vue lineup.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eDirect Filter Integration for Enhanced Views\u003c\/h3\u003e\n\u003cp\u003eThe 2\" barrel of the Big Barlow is threaded to accept standard 48mm astronomical filters. This allows you to place a filter, such as a nebula filter or a planetary color filter, in the optical train before the eyepiece. This is particularly useful for enhancing contrast on specific targets.\u003c\/p\u003e\n\u003cp\u003eFor example, you can thread in a UHC or OIII filter and use the Big Barlow to increase the image scale on a target like the Orion Nebula (M42). The filter darkens the sky background, and the Barlow brings the fine details of the Trapezium region into clear view, all while using a comfortable, long eye relief eyepiece.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eBuilt for Stability and Security\u003c\/h3\u003e\n\u003cp\u003eWeighing in at just over a pound, the Big Barlow is a substantial piece of equipment. Its all-metal construction is designed to prevent any flexure, even when holding heavy 2\" eyepieces like a 31mm Nagler. This mechanical rigidity is essential for maintaining optical alignment at high magnifications.\u003c\/p\u003e\n\u003cp\u003eThe one genuine trade-off for this performance is its weight and size. It requires a robust 2\" focuser and may necessitate re-balancing the telescope, particularly on smaller mounts. However, this is a necessary compromise to achieve a stable, flex-free optical train capable of supporting the best eyepieces available.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eChoosing Your Amplifier: Big Barlow vs. Powermate\u003c\/h3\u003e\n\u003cp\u003eTele Vue offers two distinct families of amplifiers. The choice depends on your primary application.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTele Vue 2x Big Barlow:\u003c\/strong\u003e This is the ideal choice for visual observers who want a simple, high-performance 2x multiplier that is nearly parfocal and preserves the eyepiece's eye relief. It is optimized for placing between the telescope and the eyepiece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTele Vue 2x Powermate:\u003c\/strong\u003e The Powermate is the superior choice for imaging. Its telecentric design is specifically engineered to work well with coma correctors and to be used in front of a diagonal for applications like Hydrogen-alpha solar observing, where it acts as a secondary telecentric element. For visual use, its performance is similar to the Big Barlow, but for imaging, the Powermate offers more flexibility.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Big Barlow the same as a Powermate?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, while both use a 4-element design, the Big Barlow is optimized for visual use and being parfocal. The Powermate is a true telecentric amplifier designed for both visual and imaging, offering more flexibility for complex imaging trains and solar applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the 2x Big Barlow work with my fast f\/4.5 Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the 4-element design provides excellent correction and maintains sharp star images even in fast optical systems. It is a much better choice for fast scopes than a standard 2-element Barlow, which can induce aberrations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need to rebalance my telescope when I use this?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAt over one pound, it is very likely you will need to adjust your telescope's balance, especially when switching from a lightweight 1.25\" eyepiece. It is best suited for telescopes with sturdy focusers and mounts that can handle the extra weight.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I thread a 2\" filter onto the Big Barlow?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the 2\" barrel is threaded for standard 48mm filters. This allows you to add a filter to the optical path before the eyepiece, which is useful for nebula or planetary observing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is this better than a standard, cheaper 2\" Barlow?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Big Barlow's 4-element telecentric design offers superior aberration control, maintains the eye relief of your eyepiece, and is nearly parfocal. Cheaper 2-element designs often result in softer images, especially at the field edge, and require significant refocusing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eTV-BWC-2211\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnification Factor\u003c\/td\u003e\n\u003ctd\u003e2x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAdapter\u003c\/td\u003e\n\u003ctd\u003e2\" to 1.25\" with brass clamp ring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003e4-element, telecentric\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eFully multi-coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Threads\u003c\/td\u003e\n\u003ctd\u003eAccepts 48mm (2\") filters\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.75 lbs \/ 12 oz \/ 340 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeight\u003c\/td\u003e\n\u003ctd\u003e4.8\" \/ 122 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTele Vue 2x BIG Barlow - 2\"\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2\" to 1.25\" Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2\" Dust Cap (Top)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2\" Dust Cap (Bottom)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_2x_BIG_Barlow_2-inch_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/tele-vue-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eTele Vue 5-Year Limited Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":51223880106269,"sku":"TV-BWC-2211","price":364.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_2x_Big_Barlow_2in_1.jpg?v=1777515017"},{"product_id":"tele-vue-3x-barlow-1-25-inch","title":"Tele Vue 3x Barlow - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eMagnification Factor: 3x\u003c\/li\u003e\n\u003cli\u003eBarrel Size: 1.25\"\u003c\/li\u003e\n\u003cli\u003eOptical Design: 3-element, apochromatic\u003c\/li\u003e\n\u003cli\u003eCoatings: Fully multi-coated\u003c\/li\u003e\n\u003cli\u003eCompression Ring: Yes, brass\u003c\/li\u003e\n\u003cli\u003eFilter Threads: Yes, 1.25\"\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eManual\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eTriple Your Magnification, Not Your Eyepiece Collection\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue 3x Barlow - 1.25\" is a compact, high-performance image amplifier that triples the power of any 1.25\" eyepiece in your collection. Designed with a sophisticated 3-element optical system, it delivers sharp, high-contrast views that preserve the original quality of your favorite eyepieces, making it an essential tool for serious lunar, planetary, and double-star observers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eApochromatic 3-Element Optical Design\u003c\/h3\u003e\n\u003cp\u003eUnlike a standard Barlow that uses a simple two-element design, the Tele Vue 3x Barlow employs a three-element, apochromatic layout. This additional lens corrects for chromatic aberration and other optical errors introduced by the magnification process itself. The result is a view with significantly reduced false color, enabling you to see the true hues of Jupiter's cloud bands and the subtle color differences in binary star pairs.\u003c\/p\u003e\n\u003cp\u003eThis design also maintains the eye relief and exit pupil characteristics of your eyepiece better than simpler designs. When you insert a 25mm Plössl, it performs like a high-power 8.3mm eyepiece, but you retain the comfortable eye relief of the 25mm. This is a critical advantage for observers who wear glasses or prefer the comfort of longer focal length eyepieces during high-magnification sessions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eFully Multi-Coated for Maximum Contrast\u003c\/h3\u003e\n\u003cp\u003eEvery air-to-glass surface in the 3x Barlow is multi-coated with Tele Vue's proprietary anti-reflection coatings. This meticulous process ensures that more than 99% of the incoming light passes through to your eye, preventing internal reflections that can wash out faint details. The practical effect is a darker background sky and a higher-contrast image, allowing you to pick out faint crater-floor details on the Moon or the delicate crepe ring of Saturn against the planet's glare.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eParfocal for Seamless Power Changes\u003c\/h3\u003e\n\u003cp\u003eThe Tele Vue 3x Barlow is engineered to be approximately parfocal with Tele Vue eyepieces. This means that when you insert the Barlow and eyepiece combination into your focuser, the image will remain nearly in focus. This thoughtful design minimizes the need for large focus adjustments, saving valuable time in the field and allowing you to switch between low and high power quickly without losing your target.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSecure, Non-Marring Brass Clamp Ring\u003c\/h3\u003e\n\u003cp\u003eTo protect your eyepiece investment, the Tele Vue 3x Barlow uses a brass compression ring instead of a simple set screw. When you tighten the lock screw, the soft brass ring gently and evenly squeezes the eyepiece barrel. This provides a more secure, centered grip that preserves perfect optical alignment and prevents the deep scratches and gouges that set screws inflict on your equipment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eIntegrated 1.25\" Filter Threads\u003c\/h3\u003e\n\u003cp\u003eThe bottom of the Barlow's barrel is threaded to accept standard 1.25\" astronomical filters. This allows you to add a Moon filter, a color planetary filter, or a light pollution filter to the Barlow itself. Any eyepiece you then insert will benefit from the filtration, saving you the hassle of threading and unthreading filters from individual eyepieces as you change magnifications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSaturn's Division, Sharpened and Defined\u003c\/h3\u003e\n\u003cp\u003eThe true test of a high-power accessory is how it performs on a challenging target when seeing conditions are favorable. With a quality 12mm eyepiece in a 4-inch refractor, providing 75x magnification, slide the 3x Barlow into the diagonal. The power jumps to 225x, and as your eye settles, the Cassini Division in Saturn's rings transforms from a thin, hazy line into a sharp, black gap. The Barlow's control of scattered light makes the separation distinct, a direct result of the multi-coated, 3-element optics at work.\u003c\/p\u003e\n\u003cp\u003eOne trade-off of this high magnification is a dimmer image and a greater sensitivity to atmospheric turbulence. On nights of poor seeing, the 3x amplification may be too much, and a 2x Barlow might provide a more stable view. This makes the 3x Barlow a specialist for nights when the atmosphere cooperates, rewarding your patience with moments of genuine resolution.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eChoosing Your Magnification: Tele Vue Barlows and Powermates\u003c\/h3\u003e\n\u003cp\u003eTele Vue offers several magnification options. Understanding where the 3x Barlow fits in helps in making the right choice for your observing style.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. Tele Vue 2x Barlow:\u003c\/strong\u003e The 2x Barlow is a versatile workhorse, ideal for general-purpose use and a good match for most telescopes. The 3x Barlow is a more specialized tool, designed for when you need a significant jump in power for planetary observation or splitting tight double stars, and when seeing conditions permit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. Tele Vue 2.5x Powermate:\u003c\/strong\u003e The Powermate is a 4-element design that is more complex and specifically designed to be telecentric, meaning it keeps the light rays parallel. This is a critical feature for imaging and for use with hydrogen-alpha solar filters. For purely visual use, the 3x Barlow offers more magnification in a lighter, more affordable package, while the Powermate provides a higher degree of optical correction for imagers.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhen should I use a 3x Barlow instead of a 2x?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eUse the 3x Barlow when observing bright targets like the Moon and planets on nights of good atmospheric seeing. It provides the high magnifications needed to resolve fine details that a 2x Barlow might not reach with your existing eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the 3x Barlow work with my non-Tele Vue eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the Tele Vue 3x Barlow is compatible with any standard 1.25\" eyepiece. Its high-quality optics are designed to amplify the image without introducing significant aberrations, preserving the performance of your eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs a 3x Barlow too much power for my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA general rule is to not exceed 50x to 60x per inch of aperture. If you have a 4\" (100mm) telescope, your practical limit is around 200-240x. The 3x Barlow may push past this limit with shorter focal length eyepieces, so it's best used with mid-to-low power eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat's the difference between a Barlow and a Powermate?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA Barlow is a diverging lens that increases focal length. A Powermate is a 4-element telecentric amplifier that corrects for aberrations while magnifying. For visual use, both are excellent, but Powermates are superior for imaging as they do not change the exit pupil position of the eyepiece.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use filters with this Barlow?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the barrel of the Tele Vue 3x Barlow is threaded to accept standard 1.25\" filters. This allows you to attach a filter to the Barlow and have its effect applied to any eyepiece you insert.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel #\u003c\/td\u003e\n\u003ctd\u003eBLW-3125\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnification Factor\u003c\/td\u003e\n\u003ctd\u003e3x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003e3-element, Apochromatic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eFully Multi-Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e6.4 oz (181 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeight\u003c\/td\u003e\n\u003ctd\u003e3.4\" (86 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Threads\u003c\/td\u003e\n\u003ctd\u003e1.25\" (M28.5 x 0.6)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecuring Mechanism\u003c\/td\u003e\n\u003ctd\u003eBrass Compression Ring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTele Vue 3x Barlow - 1.25\"\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e1.25\" Dust Cap (Top)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e1.25\" Dust Cap (Bottom)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_3x_Barlow_1.25-inch_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/tele-vue-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eTele Vue 5-Year Limited Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":51223880204573,"sku":"TV-BLW-3125","price":214.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_3x_Barlow_1.25in_1.jpg?v=1777515018"}],"url":"https:\/\/davidastro.com\/collections\/televue-barlow-lenses.oembed","provider":"David Astro","version":"1.0","type":"link"}