JavaScript seems to be disabled in your browser.
You must have JavaScript enabled in your browser to utilize the functionality of this website.

2" Star Diagonals

A star diagonal is a mirror or prism system that lets you view objects that are at an angle (usually 90°) from the direction a refractor or catadioptric (Schmidt-Cassegrain or Maksutov-Cassegrain) telescope is pointing. This allows you to view comfortably when the telescope is pointed at, or near, the zenith (i.e. directly overhead) by looking straight into the scope in order to see overhead. You don't have to twist your neck into an uncomfortable position to see objects over your head with a star diagonal. The image in a star diagonal is right side up, but will be reversed from left to right. A star diagonal cannot be used with a reflector telescope, nor is it needed with such a scope.

$Adapter to use 2" refractor diagonals on Schmidt-Cassegrains$

Quick view

Tele Vue Adapter to use 2" refractor diagonals on Schmidt-Cassegrains

$60.00

This adapter tube lets you use 2" refractor-type star diagonals on a Schmidt-Cassegrain telescope's threaded rear cell . . .
Quick view

Tele Vue Schmidt Cassegrain 2" Everbrite Diagonal Rich Field Kit

$371.00

This kit is designed to allow a premium Tele Vue 2" Everbrite diagonal attach to your SCT.
Quick view

Tele Vue 2" Mirror diagonal with 96% reflectivity enhanced aluminum coatings and 2" to 1.25" eyepiece adapter

$305.00

This 90° 2” mirror-type star diagonal has enhanced aluminum mirror coatings for 96% reflectivity. The mirror is overcoated with quartz for long life. The diagonal is designed for refractors with 2” focuser drawtubes . . .
Quick view

Tele Vue 2" Everbrite Star Diagonal Package with 2" to 1.25" Adapter

$393.01

3 Review(s)

This premium 90° 2” mirror-type star diagonal has Everbrite dielectric mirror coatings for 99% reflectivity and is finished in a handsome matte satin black with a 2" to 1.25" adapter . . .
Quick view

Celestron 2" Starbright XLT Enhanced aluminum mirror diagonal for SCTs

$189.95

2 Review(s)

This 2" first surface mirror diagonal for Schmidt-Cassegrains has a 1.25" eyepiece adapter and Starbright XLT enhanced multicoatings for better than 96% reflectivity . . .
Quick view

Astro-Tech 2" 99% Reflectivity dielectric mirror diagonal for SCTs

$149.95

11 Review(s)

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 from first-class price . . .
$Astro-Tech 2" 99% Reflectivity Dielectric Mirror Diagonal For Refractors$

Quick view

Astro-Tech 2" 99% Reflectivity Dielectric Mirror Diagonal For Refractors

$129.95

15 Review(s)

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 . . .
Quick view

Takahashi 1/10Th wave accuracy 2" compression ring Diagonal w/1.25" adapter

$580.00

This 2" diagonal uses a telescope-grade elliptical mirror with a guaranteed 1/10th wave surface accuracy for superb high contrast/high detail lunar, planetary, and deep space images . . .
Quick view

Questar 2" Quartz silver mirror for 7" Questars

$895.00

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 mirror coatings for optimum light transmission and contrast.
Quick view

Celestron 2" DIELECTRIC STAR DIAGONAL WITH TWIST-LOCK

$249.95

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