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15 x 15 x 21mm Optical Material: BK7 optical glass Multi-coated optics 60/40 scratch/dig quality Surface Flatness: λ/4 dimensional tolerance: +-0.10mm angle tolerance:+-5 arc minutes The reflecting surfaces are AlSiO coated and protected by black paint. Penta prisms reflect light thru a 90 degree angle by 2 internal reflections. They do not invert or revert the image.
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