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If you want a high-end mirror diagonal for your Schmidt-Cassegrain telescope,
this GSO 2" Quartz Dielectric Diagonal Mirror is an excellent choice. GSO's 2" SCT diagonal features dielectric coatings with 99% reflectivity across the visible spectrum and a 1/12 wave quartz mirror. The all metal diagonal body is CNC machined. The combined result is a
superb diagonal offering excellent mechanical and optical quality at a
great price. Dielectric coatings are more durable than regular or
enhanced aluminum coatings, so you will enjoy years of excellent
performance from this product. Diagonals with comparable quality and
specifications often sell for $200 or more in today's astronomy market.
High quality diagonal mirrors are usually made of BK7 glass. Quartz glass goes a notch higher - it offers greater thermal stability, resulting in minimal thermal expansion and contraction as compared to other glass types. The result is a minimal, if any, shift in focus due to temperature changes over long observation sessions, making this quartz diagonal ideal for photographic and imaging applications.
You
can attach this diagonal directly to Schmidt-Cassegrain telescopes and
many Maksutov-Cassegrain telescopes, as long as there is a SCT male thread on the
telescope.
A 1.25"-2" adapter is included so you can use this diagonal with 1.25" or 2" eyepieces. The 1.25" and 2" holders both feature a brass compression ring, so your eyepiece barrels will not be scratched by the set screw. The 1.25"-2" adapter is also threaded to accept 2" filters. The diagonal comes in a very nice foam-fitted storage box and includes 2 end caps. Weight = 1lb-4oz. (with 1.25" adapter); 1lb-1oz. (without 1.25" adapter). Made in Taiwan.
Description copyright: Agena
AstroProducts (2008). Reproduction without permission prohibited.
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