Home · Diagonals · 2" 99% Reflectivity Dielectric Mirror Diagonals 2" 99% Reflectivity Dielectric Mirror Diagonal for Refractors This 2” Astro-Tech first-surface mirror star diagonal has state-of-the-art 46-layer dielectric mirror coatings for a full 99% reflectivity. You see virtually all the light your scope collects. Its optical performance, quality machining, 2” non-marring compression ring eyepiece holder, and standard equipment 1.25” compression ring eyepiece adapter make it unique among premium 2” star diagonals for its exceptional price/performance ratio. 2" 99% Reflectivity Dielectric Mirror Diagonal for SCTs The state-of-the-art 46-layer dielectric mirror coatings of this 2” Astro-Tech first-surface mirror diagonal for SCTs provide a full 99% reflectivity. You see virtually everything your scope is capable of showing. It threads directly onto the scope’s rear cell and will clear the drive base of virtually any SCT. A 2” non-marring compression ring eyepiece holder and 1.25” compression ring eyepiece adapter are standard equipment.
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