William Optics Dura-Bright Rotolock 2-Inch WO Diagonal

  • Dielectric coating allows 99-inch reflectivity
  • Polished to 1/12th wave accuracy
  • Accurate design guarantees constant alignment. No further alignment needed
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  • Regular price $198.00

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William Optics Dura-Bright Rotolock 2-Inch WO Diagonal

William Optics 2-Inch Rotolock Dura-Bright 90-Degree Diagonal  - a dramatic step forward in the evolution of mirror diagonals!

Simply rotate the adapter ring clockwise to lock any inserted accessory, or counter-clockwise to release the accessory. Innovative design ensures that you get a very solid hold and the accessory is perfectly centered every time. No thumbscrews to worry about! The internal ball bearings and detents make this adapter a joy.

This 90-degree 2-inch mirror-type star diagonal has a Dura-Bright 12 mm thick mirror and dielectric mirror coatings for 99-percent reflectivity which provides higher contrast and resolution during critical planetary, lunar and binary star observations.

Dura-Bright features 100-percent real carbon fiber side plates that add that touch of class your scope deserves.

This WO 2-Inch Dura-Bright Diagonal was designed with several unique features to provide optimum performance and years of use.

Top-Notch Performance and brightness 
• Dielectric coating allows 99-inch reflectivity.
• high precision 12 mm thick mirror substrate flat for optimal image stability. 
• Polished to 1/12th wave accuracy.
• Accurate design guarantees constant alignment. No further alignment needed. 
• Threaded for 48 mm Filters.

Strikingly Beautiful
• Patented, elegant design.
• High-quality machining out of the best aluminum.
• Internal antireflection baffling for highest contrast. 
• Real Carbon Fiber side plates

Superbly Constructed
• Internal safety stop prevents 2-inch barrels from hitting the mirror. 
• Designed for high-end scope such as FLT-98, FLT-110 , GT/GTF102, and FLT-132.


Why W.O. diagonals do not feature an Adjustable alignment system?

• Having an adjustable alignment system is an admission that the diagonal can go out of collimation due to poor mechanical construction. Thanks to the patented design of WO diagonals, you will always have a as perfectly as on the first day you got it! 


Please Note: A 1.25-inch adapter is not included, but may be purchased separately.   SCT adapter: • SCT ring makes your diagonal work on SC telescopes or the William Optics' ZS66 series as well! Get one diagonal, use it on ANY telescope! 



Angle90 degree
Diagonal Barrel Size2"
Free ShippingYes
Optical Coatings99% Dielectric
Weight1.1 lb
Customer Reviews
5.0 Based on 2 Reviews
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Brad L.
United States United States
Nice Diagonal

Excellent build, visual and aesthetic quality!

Joe R.
United States United States
Best diagonal for the $

I've used several manufacturer diagonals over the years with many different OTAs the William Optics diagonals go the extra mile. The image quality has a noticeable improvement a bright fully illuminated field of view. The build quality is excellent very robust. I really like the Rotolock feature it tightly holds my heavy hand grenade 30mm 82° eyepiece with confidence. I don't have to worry about it slipping when it's slewing the EQ mount.