Home · Diagonals · 2" 99% Reflectivity Quartz Dielectric Mirror Diagonals 2" 99% Reflectivity Quartz Dielectric Mirror Diagonal for Refractors This 2” Astro-Tech first-surface mirror star diagonal for refractors has state-of-the-art 46-layer 99% reflectivity dielectric mirror coatings on its guaranteed 1/10th wave accuracy quartz mirror. You get an interferogram as proof of your diagonal’s performance. A 2” non-marring compression ring eyepiece holder and 1.25” compression ring eyepiece adapter are standard equipment. It’s an unprecedented value. 2" 99% Reflectivity Quartz Dielectric Mirror Diagonal for SCTs This 2” Astro-Tech first-surface mirror diagonal for SCT rear cells has a quartz mirror with guaranteed 1/10th wave accuracy. State-of-the-art 46-layer dielectric mirror coatings give you a full 99% reflectivity. A supplied interferogram shows you your diagonal’s performance. A 2” non-marring compression ring eyepiece holder and 1.25” compression ring eyepiece adapter are standard equipment.
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