Home · Visual Accessories · Star Diagonals 1.25" 99% reflectivity dielectric mirror diagonal with compression ring eyepiece holder The Astro-Tech 1.25” dielectric mirror-type star diagonal was a Sky & Telescope Hot Product for 2007! Considering its premium performance and economical price, it’s still a hot product today. 46-layer dielectric coatings for a full 99% reflectivity and visibly higher contrast in lunar and planetary observing; a 1/10th wave BK7 optical glass substrate; and a brass compression ring eyepiece holder that won’t scratch your eyepiece barrels. 2" 99% reflectivity dielectric mirror diagonal for refractors, with compression ring eyepiece holder and 1.25" adapter The Astro-Tech 2” dielectric mirror-type star diagonal has premium performance and features at an economical price. 46-layer dielectric coatings for a full 99% reflectivity and a very smooth surface for visibly higher contrast in lunar and planetary observing; a 1/10th wave BK7 optical glass substrate; a 2” brass compression ring eyepiece holder that won’t scratch your eyepiece barrels; and a separate compression ring adapter for 1.25” eyepieces. 2" 99% reflectivity dielectric mirror diagonal for SCTs, with compression ring eyepiece holder and 1.25" adapter The Astro-Tech 2” dielectric mirror-type star diagonal for Schmidt-Cassegrains threads directly onto the rear cell of an SCT with no adapter needed. It has 46-layer dielectric coatings for 99% reflectivity; a very smooth surface for visibly higher lunar and planetary contrast; a 1/10th wave BK7 optical glass substrate; a 2” brass compression ring eyepiece holder that won’t scratch eyepieces; and a separate compression ring adapter for 1.25” eyepieces 2" 99% reflectivity guaranteed 1/10th wave dielectric quartz mirror diagonal for SCTs, with compression ring eyepiece holder and 1.25" adapter The Astro-Tech 2” dielectric mirror-type quartz star diagonal for Schmidt-Cassegrains threads directly onto an SCT with no adapter needed. It has 46-layer dielectric coatings for 99% reflectivity; separate 1.25” and 2” brass compression ring eyepiece holders; a thermally stable quartz substrate with a guaranteed 1/10th wave surface accuracy after coating; and a very smooth surface for visibly higher lunar and planetary contrast. Astro-Tech one-piece machined 2" diagonal with 1/10th wave quartz mirror, 99% reflectivity dielectric coatings, compression ring eyepiece holder, and 1.25" adapter The Astro-Tech 2” dielectric mirror-type quartz star diagonal has one-piece body; 46-layer dielectric coatings for a full 99% reflectivity; a non-marring 2” brass compression ring eyepiece holder; and a separate compression ring adapter for 1.25” eyepieces. It has a thermally stable quartz substrate with a guaranteed 1/10th wave surface accuracy after coating and a very smooth surface for visibly higher contrast in lunar and planetary observing.

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