{"id":17649,"date":"2026-09-20T18:31:27","date_gmt":"2026-09-20T16:31:27","guid":{"rendered":"https:\/\/deep-space-astronomy.ch\/?post_type=product&p=17649"},"modified":"2026-10-31T08:46:27","modified_gmt":"2026-10-31T07:46:27","slug":"televue-big-barlow-2x-2-pouces","status":"publish","type":"product","link":"https:\/\/deep-space-astronomy.ch\/en\/product\/televue-big-barlow-2x-2-pouces\/","title":{"rendered":"Tele Vue Big Barlow 2x \u2013 2 inches"},"content":{"rendered":"

The 2-inch format for your high-magnification observations<\/h3>\n

The Tele Vue Big Barlow 2x increases the effective focal length of your telescope. Using the same eyepiece, it allows you to achieve a nominal magnification that is twice as high. This solution complements a selection of eyepieces for exploring lunar details, observing the planets, or zooming in on a specific target. The manufacturer\u2019s part number for this model is BWC-2211<\/strong>.<\/p>\n

A two-element lens<\/h3>\n

The Tele Vue design uses two high-index glass elements and multi-layer coatings. The manufacturer tests its Barlow lenses across the entire field of view using an open system at f\/4. This design is intended to preserve contrast and minimize aberrations introduced into the optical path. The final image quality also depends on the telescope, its focus, and atmospheric conditions: higher magnification does not reveal additional details when turbulence obscures them.<\/p>\n

For 2-inch eyepiece holders, with a 1.25-inch adapter<\/h3>\n

The Big Barlow is compatible with both 2-inch and 1.25-inch eyepieces thanks to the included adapter. The brass clamping rings hold the accessories in place without the screw pressing directly against their threads. It features a 48 mm filter thread and a captive locking screw.<\/p>\n

Important point to consider before purchasing:<\/strong> Tele Vue highly recommends it for Newtonian telescopes, where it is designed to maintain focus with both eyepiece sizes. The manufacturer does not recommend using it with a 2-inch offset mirror: its length prevents parfocality, and some telescopes may not be able to focus properly. Be sure to check the mounting and travel of your eyepiece holder.<\/p>\n

Technical specifications<\/h3>\n\n\n\n\n\n\n\n\n\n\n\n\n
Manufacturer<\/th>\nTele Vue<\/td>\n<\/tr>\n
Reference<\/th>\nBWC-2211<\/td>\n<\/tr>\n
Rated amplification<\/th>\n2x<\/td>\n<\/tr>\n
Flow on the telescope side<\/th>\n2 inches (50.8 mm)<\/td>\n<\/tr>\n
Accepted eyepieces<\/th>\n2 inches and 1.25 inches with the included adapter<\/td>\n<\/tr>\n
Optics<\/th>\n2 high-index glass elements<\/td>\n<\/tr>\n
Treatments<\/th>\nMultilayer<\/td>\n<\/tr>\n
Tightening<\/th>\nBrass ring; captive screw<\/td>\n<\/tr>\n
Filter thread<\/th>\n48 mm<\/td>\n<\/tr>\n
Approximate weight<\/th>\nAbout 340 g (0.75 lb, according to the manufacturer)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Making the Right Choice: Frequently Asked Questions<\/h3>\n

What magnification will I get?<\/strong> Magnification is calculated by dividing the telescope\u2019s focal length by that of the eyepiece, then applying the nominal factor of 2x. Choose a combination that is suitable for your instrument\u2019s diameter and provides a stable image.<\/p>\n

Is this a Powermate?<\/strong> No. This is a two-element Tele Vue Barlow lens, distinct from the Powermate line. For a photographic setup or an unusual spacing, the actual magnification may depend on the distance between the Barlow lens and the image plane: do not consider the nominal magnification to be a guarantee for every setup.<\/p>\n

Official Tele Vue Documentation on Barlow Lenses<\/a><\/p>\n<\/div><\/div>","protected":false},"excerpt":{"rendered":"

Barlow Tele Vue 2x with a 2-inch (50.8 mm) slip-on mount, featuring two multi-coated elements and a brass clamping ring. Includes a 1.25-inch adapter; particularly well-suited for Newtonian telescopes.<\/p>","protected":false},"featured_media":17652,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[629],"product_cat":[369,833],"product_tag":[],"class_list":["post-17649","product","type-product","status-publish","has-post-thumbnail","product_brand-televue","product_cat-barlows","product_cat-en-stock","first","instock","taxable","shipping-taxable","purchasable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product\/17649","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/comments?post=17649"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media\/17652"}],"wp:attachment":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media?parent=17649"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_brand?post=17649"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_cat?post=17649"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_tag?post=17649"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}