Tele Vue 2X BIG Barlow - 2" - BWC-2211

Properly designed Barlow lenses do wonderful things: They amplify power, slow the telescope'''s f/# (improving eyepiece sharpness), and give designers the opportunity to compensate for telescope eyepiece aberrations.

Tele Vue Barlow Lenses use multi-coated high index glasses for optimum aberration correction, exceptional contrast with virtually no light loss. Observed performance is aberration free, even when tested with f/4 telescope. TeleVue Barlow Lenses even improve our competitor'''s telescope eyepieces and telescopes!

"I originally designed the TeleVue Barlow Lens line to complement the high performance of our TeleVue Telescope Eyepieces. Only 2 elements of high index glass were required to reduce all aberrations to well below the airy disc in an f/4 system. It has taken a good 15 years, but I think we'''re finally laying to rest the popular myth of the "degrading Barlow." In a 1997 Sky & Telescope review, Terrence Dickenson wrote "...Technology has erased the old objections. A modern Barlow lens will not degrade your telescope'''s optics. Anyone telling you otherwise is using outdated information. Moreover, the highly regarded Nagler TeleVue Telescope Eyepieces and their clones have built-in Barlows - ample evidence that the lens is not some detrimental intruder." Thanks Terry, I couldn'''t agree more." --Al Nagler

• Product design and execution deliver consummate satisfaction

   

• Features include parfocal 1.25" filter threads, captive lock screws that won't fall out and full multi-coatings

   

• All Tele Vue Barlows now use brass clamp rings for secure, non marring holding of eyepieces and accessories

   

• Multi-coated high index glasses for optimum aberration correction, exceptional contrast with virtually no light loss

   

• Every Tele Vue Barlow must pass the same rigorous f/4, full field testing as all their eyepieces

Optics Type: 2X Barlow Lens

Barrel Size: 2"

Coatings: Full multi-coatings

Weight: 0.75 lbs.

Parfocal: Yes

Threaded: Yes

Glass Type: High Index

Warranty: Limited Lifetime

TeleVue Product Number: BWC-2211