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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.
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