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The Lumicon 2" Enhanced Aluminum 90° Diagonal reflects 96 to 97% of the light from the telescope's primary optics directly into your eyepiece. In this way, you'll hardly lose anything from what your telescope sees. It may also be used on refractors and Schmidt-Cassegrain telescopes when equipped with a 2" visual back.
Lumicon collimates each diagonal mirror via a double-pass collimator, ensuring that the light reflected from the diagonal is perfectly perpendicular to the telescope's optical axis.
Ensures that almost 100% of the light from your telescope's optic reaches the eyepiece
Its single 1/8 wave precision-polished surface is superior to the three surfaces of prism diagonals