William Optics 2" Quartz Dielectric Diagonal

Our Price:  £229.00(Inc. 20% VAT) Model:  WOQuartzDielectric2inch Brand:  William Optics Tweet

Fits refractors with 2-inch focusers and SCT type telescopes.

If you are looking for the highest achievable brightness, contrast and sharpness during critical observations with high-end instruments, the WO 90° 2" mirror Quartz Dielectric star Diagonal is a fine choice.

One of the very best diagonals available!

• Dielectric coating allows 99% reflectivity.
• 10mm thick substrate flat for optimal image stability.
• Quartz being a harder material, it can be polished to a higher accuracy. Quartz also boasts one of the lowest expansion rate compared to other materials.
• Accurate 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.
• High-quality machining out of the best aluminium.
• Inside diameter (48mm) threaded to accept filters.
• Compression rings (both on diagonal and adapter) to prevent barrels’ marring.
• Internal safety stop prevents 2” barrels from hitting the mirror.

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