{"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","url":"https:\/\/davidastro.com\/products\/tele-vue-2x-barlow-1-25-inch","provider":"David Astro","version":"1.0","type":"link"}