Diagonals & Prisms

This 2” dielectric mirror-type star diagonal is an outstanding value. At this low price, if there ever was a bargain in astronomy, this is it. This...

This 1.25" Astro-Tech first-surface mirror star diagonal was named a Sky & Telescope Hot Product for 2007! Sky & Tel recognized that the As...

This 2" dielectric mirror-type star diagonal is designed to give you first-class performance with a Schmidt-Cassegrain - at a money-saving and far ...

This Celestron 2" mirror star diagonal for catadioptric telescopes has Starbright XLT enhanced aluminum multicoatings for a reflectivity of better ...

This 90° 2” mirror-type star diagonal has Everbrite dielectric mirror coatings for 99% reflectivity. In addition to higher reflectivity than a conv...

A Star Diagonal lets you view objects that are at a 90° angle from the direction the telescope is pointing, thereby allowing comfortable viewing wh...

This 90° 1.25" mirror-type star diagonal has Everbrite dielectric mirror coatings for 99% reflectivity. In addition to higher reflectivity than a c...

This 45-degree viewing angle image erecting diagonal is designed to use 1.25" eyepieces in catadioptric scopes with a 1.25" visual back or in refra...

This 90° 1.25" mirror-type star diagonal uses enhanced aluminum mirror coatings for a full 95% reflectivity. The mirror is overcoated with quartz f...

This kit is designed to allow a premium Tele Vue 2" Everbrite diagonal attach to your SCT. This 90° 2” mirror-type star diagonal has Everbrite diel...

This 90° 2” mirror-type star diagonal has enhanced aluminum mirror coatings for 96% reflectivity. The mirror is overcoated with quartz for long lif...

Looking for a quick way to change magnifications and not use a zoom eyepiece?  This great accessory from Takahashi might be the ticket.A night of o...

Enjoy better views through your telescope with this premium diagonal featuring diffraction-limited optics and dielectric coatings Ensure maximum li...

This 2" Questar star diagonal allows the use of 2" eyepieces with the 7" Questar Maksutov. Its 1/20th wave first surface quartz mirror has silver m...

This 2" diagonal uses a telescope-grade elliptical mirror with a guaranteed 1/10th wave surface accuracy for superb high contrast/high detail lunar...

This unique 60° viewing angle 1.25" diagonal allows more comfortable extended viewing of objects near the ecliptic (the Moon and planets, among oth...

Use the iOptron 90° Dielectric Star Diagonal to place your head in a comfortable viewing position when your refractor or catadioptric optical tube ...

This premium Questar 45° viewing angle image erecting diagonal fits into the back of any Questar 3.5" scope to provide upright and correctly left-t...

This premium 1.25" Takahashi TAKSD1 compression ring prism star diagonal is the diagonal that Takahashi puts with all of their complete telescope s...