SmartAstronomy's 2” 90 degree Dielectric mirror star diagonal uses New Advanced 46-Layered Multicoated Dielectric mirror coatings for a full 99% reflectivity. The mirror’s 10mm thickness is 1/10th wave BK7 optical glass. The housing is machined from solid aluminum. The body construction weighs 17 ounces. The barrel is threaded to accept standard 2” filters. The 2” eyepiece holder uses a non-marring brass compression ring to secure 2” eyepieces and the 1.25”eyepiece adapter (also brass ring) in place rather than a thumbscrew that can scratch an eyepiece barrel by tightening down on it directly. The extra long and large chrome thumbscrew for the brass compression ring is a full 1/2” in diameter. The 2” Dielectric diagonal works with any Refractor that uses a 2”star diagonal. It can also be used with Schmidt-Cassegrain, or Maksutov with adapter. |
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