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Enjoy better views through your telescope with this premium diagonal featuring diffraction-limited optics and dielectric coatings Provides a 90° viewing angle, perfect for more comfortable viewing through refractor and cassegrain-type telescopes 58 layers of dielectric coatings provide an over 99% reflective surface, ensuring the maximum amount of light collected by the telescope reaches the eyepiece Twist-lock keeps the eyepiece centered in the diagonal to provide better optical alignment Accepts standard eyepieces, Barlow lenses, threaded filters, and other accessories with a 1. 25” Barrel