{"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\u003e5.2 oz (147 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":153.0,"currency_code":"USD","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\/fr-eu\/products\/tele-vue-3x-barlow-1-25-inch","provider":"David Astro","version":"1.0","type":"link"}