William Optics 1.25" 90 RedCat Erecting Prism Silver

  • Available for RedCat 51 and WhiteCat 51 Only.
  • Image Erecting BAK4 Prism with Anti-reflection Coating.
  • High Accuracy and High Light Transmission Prism.
  • 1.25-inch Barrel for Any 1.25-inch Eyepieces.
  • Sale
  • Regular price $118.00

In Stock
Free Shipping
Add to Wishlist
Already have gear? Trade it in for cash or new equipment.

Accessories Added

OPT Telescope Expert

Want Help?

Ask Our Telescope Experts


William Optics 1.25" 90 RedCat Erecting Prism Silver

The William Optics 1.25-inch 90-degree RedCat Erecting Prism is durable and designed with a silver anodized plate. Its complete housing is made by 6061T Aluminum by CNC. 

Attach it to your RedCat or WhiteCat telescope to provide better performance for daytime observations. It's also equipped with an anti-reflection coating producing, high accuracy and high light transmission.

Features of the William Optics 1.25-inch Erecting Prism

  • Unique design and superior craftsmanship.

  • Internally matte blackened and threaded for no internal stray light reflection.

  • Entirely aluminum, silver anodized.
William Optics Product Number: D-EP90-125-RC51-SL


Angle90 degree
Free ShippingYes
Customer Reviews
5.0 Based on 1 Reviews
Write a Review Ask a Question
  • Reviews
  • Questions

Thank you for submitting a review!

Your input is very much appreciated. Share it with your friends so they can enjoy it too!

Filter Reviews:
Ron W.
United States United States

This piece is just as awesome as the Red Cat 51 itself. The only negative was the fact I did not receive the instructions that should have come with it. So having a nice new piece of gear I was very cautious about taking anything apart. But a call to OPT's 800 number took care of all my problems! Diana was able to ask a few pertinent questions compare a couple of photos and sent me the instructions I needed. Problem resolved. No waiting on hold just a few text messages in a few minutes was all it took. Awesome customer service / Technical support and a fine piece of WO equipment too.