Prism and Mirrors

A star diagonal mirror is used for a comfortable viewing position. It offers an upright but mirror reversed image with a high contrast.

The mirror is used on refractors, Schmidt-Cassegrains, Maksutov Cassegrains and other telescopes with a viewing position at the rear. The diagonal is not suitable for Newtonian telescopes because they do not have enough back focus.

Astro-Professional Diagonalmirror 2"

Orion Dielectric Mirror Star Diagonals 

Deluxe 2" 90 Degree Erecting Prism

Stellarvue Enhanced 2 Inch Dielectric Diagonal 

TeleVue 1.25" Enhanced Aluminum Diagonal

TeleVue 1.25" Everbrite Diagonal

TeleVue 2" Enhanced Aluminum Diagonal

TeleVue 2" Everbrite 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. This dielectric diagonal features 100% real carbon fiber side plates that add that touch of class your scope deserves. A premium product at a discounted price. Check it out and see the difference between a "budget diagonal" and a real bargain! 

William Optics 2" Quartz Dielectric Diagonal