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William Optics 2 Inch Dielectric Diagonal
If what you are looking for is the highest achievable brightness contrast and sharpness during critical observations with high-end instruments WO 90? 2 mirror Dielectric star Diagonal is your choice. SpecificationsDielectric coating allows 99% reflectivity.10mm thick substrate flat for optimal image stability. Polished to 1/10th wave accuracyAccurate design guarantees constant alignment. No further alignment needed.2 to 1.25 eyepiece adapter included. Lock screw for eyepiece/adapter.Big knurled thumbscrews easy to turn even with gloves on.Patented elegant designHigh-quality machining out of the best aluminumInternally antireflection threaded for highest contrastCompression rings (both on diagonal and adapter) to prevent barrels marringInternal safety stop prevents 2 barrels from hitting the mirror
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