Tele Vue 1.25" 3x Barlow
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Concept:
"I originally designed the Tele Vue Barlow line to complement the high performance of our 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 will not degrade your telescope's optics. Anyone telling you otherwise is using outdated information. Moreover, the highly regarded Nagler 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
Properly designed Barlows do wonderful things: They amplify power, slow the telescope's f/# (improving eyepiece sharpness), and give designers the opportunity to compensate for eyepiece aberrations. Tele Vue Barlows 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 scopes. They even improve their competitor's eyepieces and telescopes!
Tele Vue Quality
Compromise image quality in any part of the optical chain and you've compromised every part! Tele Vue product design and execution deliver consummate satisfaction. Every Tele Vue Barlow must pass the same rigorous f/4, full field testing as all their eyepieces. All Tele Vue Barlows now use brass clamp rings for secure, non marring holding of eyepieces and accessories.
Tele Vue 1.25" Barlow in 3x Magnification
This 3x 1.25" Barlow performs identically as Tele Vue's 2x Barlow. Simply choose this or the 2x Barlow based on your eyepiece collection. Features include parfocal-ization, 1.25" filter threads, captive lock screws that won't fall out, and full multicoatings. Weight = 0.40 lbs.
Other Information
- Country of Manufacture: Japan
Concept:
"I originally designed the Tele Vue Barlow line to complement the high performance of our 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 will not degrade your telescope's optics. Anyone telling you otherwise is using outdated information. Moreover, the highly regarded Nagler 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
Properly designed Barlows do wonderful things: They amplify power, slow the telescope's f/# (improving eyepiece sharpness), and give designers the opportunity to compensate for eyepiece aberrations. Tele Vue Barlows 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 scopes. They even improve their competitor's eyepieces and telescopes!
Tele Vue Quality
Compromise image quality in any part of the optical chain and you've compromised every part! Tele Vue product design and execution deliver consummate satisfaction. Every Tele Vue Barlow must pass the same rigorous f/4, full field testing as all their eyepieces. All Tele Vue Barlows now use brass clamp rings for secure, non marring holding of eyepieces and accessories.
Tele Vue 1.25" Barlow in 3x Magnification
This 3x 1.25" Barlow performs identically as Tele Vue's 2x Barlow. Simply choose this or the 2x Barlow based on your eyepiece collection. Features include parfocal-ization, 1.25" filter threads, captive lock screws that won't fall out, and full multicoatings. Weight = 0.40 lbs.
| Manufacturer | Tele Vue |
|---|
| Size Format | 1.25 inch |
|---|---|
| Magnification Factor | 3x |
| Number of Lens Elements | 2 |
| Lens Coatings | Fully multicoated |
| Total Length | 4.98 inches / 126.4 mm |
| Length of Nosepiece | 2.05 inches / 52 mm |
| Outside Length of Upper Body | 2.92 inches / 74.2 mm |
| Insertion Depth | 1.61 inches / 41 mm |
| Max Diameter Excluding Thumbscrew | 2.21 inches / 56.1 mm |
| Clear Aperture | 0.94 inches / 24 mm |
| Weight | 6 oz / 170 g |
| Barlow Lens Cell Removable | Yes |
| Filter Threads at Bottom of Barlow Cell | Yes - 1.25" (M28.5x0.6) Filter Threads |
| Filter Threads Between Barlow Cell and Tube | N/A |
| Barrel Type | Smooth-sided |
| Compatible Agena Bolt Case (with Screw Removed) | N/A |
| Compatible Bolt Case (with Screw Attached) | 65x80 |
| Number of Thumbscews | 1 |
| Thumbscrew Thread Specification | Coming Soon |
| End Caps (Subject to change without notice) | 2 |
| Compression Band/Ring in Eyepiece Holder | Yes |
| Country of Manufacture | Not disclosed by manufacturer |
Concept:
"I originally designed the Tele Vue Barlow line to complement the high performance of our 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 will not degrade your telescope's optics. Anyone telling you otherwise is using outdated information. Moreover, the highly regarded Nagler 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
Properly designed Barlows do wonderful things: They amplify power, slow the telescope's f/# (improving eyepiece sharpness), and give designers the opportunity to compensate for eyepiece aberrations. Tele Vue Barlows 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 scopes. They even improve their competitor's eyepieces and telescopes!
Tele Vue Quality
Compromise image quality in any part of the optical chain and you've compromised every part! Tele Vue product design and execution deliver consummate satisfaction. Every Tele Vue Barlow must pass the same rigorous f/4, full field testing as all their eyepieces. All Tele Vue Barlows now use brass clamp rings for secure, non marring holding of eyepieces and accessories.
Tele Vue 1.25" Barlow in 3x Magnification
This 3x 1.25" Barlow performs identically as Tele Vue's 2x Barlow. Simply choose this or the 2x Barlow based on your eyepiece collection. Features include parfocal-ization, 1.25" filter threads, captive lock screws that won't fall out, and full multicoatings. Weight = 0.40 lbs.
Other Information
- Country of Manufacture: Japan
| Manufacturer | Tele Vue |
|---|
| Size Format | 1.25 inch |
|---|---|
| Magnification Factor | 3x |
| Number of Lens Elements | 2 |
| Lens Coatings | Fully multicoated |
| Total Length | 4.98 inches / 126.4 mm |
| Length of Nosepiece | 2.05 inches / 52 mm |
| Outside Length of Upper Body | 2.92 inches / 74.2 mm |
| Insertion Depth | 1.61 inches / 41 mm |
| Max Diameter Excluding Thumbscrew | 2.21 inches / 56.1 mm |
| Clear Aperture | 0.94 inches / 24 mm |
| Weight | 6 oz / 170 g |
| Barlow Lens Cell Removable | Yes |
| Filter Threads at Bottom of Barlow Cell | Yes - 1.25" (M28.5x0.6) Filter Threads |
| Filter Threads Between Barlow Cell and Tube | N/A |
| Barrel Type | Smooth-sided |
| Compatible Agena Bolt Case (with Screw Removed) | N/A |
| Compatible Bolt Case (with Screw Attached) | 65x80 |
| Number of Thumbscews | 1 |
| Thumbscrew Thread Specification | Coming Soon |
| End Caps (Subject to change without notice) | 2 |
| Compression Band/Ring in Eyepiece Holder | Yes |
| Country of Manufacture | Not disclosed by manufacturer |
Tele Vue 1.25" 3x Barlow