Tele Vue 90 Enhanced 2" Star Diagonal - Satin Finish
The 90 Enhanced 2-Inch Star Diagonal with Satin Finish by Tele Vue:
This is the same Star Diagonal Tele Vue builds for their diffraction limited telescopes. Exquisitely crafted to fold light exactly 90-degrees. The mirror blank is polished to 1/10th the wavelength of light and vacuum coated with enhanced aluminum. Then it is over-coated to protect the delicate mirrored surface.
In order to bring the performance of Tele Vue eyepieces to as many telescopes as possible, the manufacturer offers accessories with complementing quality to their optics.
To ensure the optical alignment of the diagonal, the body is CNC machined from one solid block of aluminum. For maximum contrast they cut anti-reflection threads into the inner surfaces.
If you've ever had the experience of fumbling in the dark while moving your filter from one eyepiece to another, you will especially appreciate the convenience of the 48 mm filter threads cut into the body. A captive eyepiece lock-screw adds the finishing touch.
OPT Product Number: TE-DSC-8001
Customer Note: As of 1/1/12, Tele Vue has extended its warranty on eyepieces, Barlows, Powermates, and parracors from 5 years to a LIFETIME warranty! This will be effective on sales on 1/1 moving forward only and is not retroactive in any way. The warranty will still cover optical performance, optical coatings, optical cementing, plus mechanical components and operation of the product. This warranty still applies to the original owner and a dated proof of purchase must accompany any warranty repair claim.
Questions & AnswersAsk a Question
What is the length of light pass, in mm, inside the diagonal ?
The light path through the TeleVue diagonal is 108mm (4.25"), which is about 0.25" (6mm) shorter than moost competing 2" diagonals.