Accessories / Visual and Everything Else / 2" diagonals 2" diagonals Email page link to a friend 2" 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. Sort By:   Price | Manufacturer | Product # x   Astronomy Technologies - 2" 99% reflectivity dielectric mirror diagonal for refractors, with compression ring eyepiece holder and 1.25" adapter  Our Product #:  AT2D In Stock:  Usually ships within one business day. This 2” dielectric mirror-type star diagonal would be an outstanding value at twice the price. At this low price, if there ever was a bargain in astronomy, this is it . . . [ More details . . . ]  $119.95 $139.95 SAVE: $20.00 (14%) Add to comparison list View comparison list x   Astronomy Technologies - 2" 99% reflectivity dielectric mirror diagonal for SCTs, with compression ring eyepiece holder and 1.25" adapter  Our Product #:  AT2SD In Stock:  Usually ships within one business day. 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 . . . [ More details . . . ]  $149.95 Add to comparison list View comparison list x   Astronomy Technologies - 2" 99% reflectivity guaranteed 1/10th wave dielectric quartz mirror diagonal for refractors, with compression ring eyepiece holder and 1.25" adapter  Our Product #:  AT2DQ In Stock:  Usually ships within one business day. The state-of-the-art 46-layer dielectric coatings on this Astro-Tech 2” star diagonal give its guaranteed 1/10th wave accuracy quartz mirror a full 99% reflectivity for the brightest possible images . . . [ More details . . . ]  $189.95 Add to comparison list View comparison list x   Astronomy Technologies - 2" 99% reflectivity guaranteed 1/10th wave dielectric quartz mirror diagonal for SCTs, with compression ring eyepiece holder and 1.25" adapter  Our Product #:  AT2SDQ In Stock:  Usually ships within one business day. This 2” Astro-Tech star diagonal for catadioptric telescopes has a quartz mirror with guaranteed 1/10th wave accuracy and state-of-the-art 46-layer dielectric mirror coatings for a full 99% reflectivity and the brightest possible images . . . [ More details . . . ]  $199.95 Add to comparison list View comparison list x   Celestron - 2" mirror diagonal for refractors and SCTs, w/ 1.25" adapter  Our Product #:  7717 Celestron #: 93519 In Stock:  Usually ships within one business day. This very economical Celestron 2” mirror diagonal with 1.25" eyepiece adapter can be used both in refractor telescopes with 2” focusers, and on all Schmidt-Cassegrain telescopes . . . [ More details . . . ]  $72.95 List Price: $112.95 Add to comparison list View comparison list x   Celestron - 2" Starbright XLT enhanced aluminum mirror diagonal, with compression ring eyepiece holder and 1.25" adapter  Our Product #:  7718 Celestron #: 93526 In Stock:  Usually ships within one business day. This 2” first surface mirror diagonal for refractors has a 1.25" eyepiece adapter and Starbright XLT enhanced multicoatings for better than 96% reflectivity . . . [ More details . . . ]  $139.95 List Price: $198.00 Add to comparison list View comparison list x   Celestron - 2" Starbright XLT enhanced aluminum mirror diagonal for SCTs, with compression ring eyepiece holder and 1.25" adapter  Our Product #:  7719 Celestron #: 93527 In Stock:  Usually ships within one business day. 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 . . . [ More details . . . ]  $139.95 List Price: $198.00 Add to comparison list View comparison list x   Denkmeier - Power x Switch diagonal #R1 for refractors, for binoviewer or 1.25"/2" eyepiece use, closeout  Our Product #:  PSDR1 Denkmeier #: R1 In Stock:  Usually ships within one business day. New closeout. This multifunction star diagonal for refractors has instantly switchable optics to give you three separate magnifications from a binoviewer or a 1.25” or 2” single eyepiece . . . [ More details . . . ]  $419.00 $499.00 SAVE: $80.00 (16%) Add to comparison list View comparison list x   Denkmeier - Power x Switch diagonal #R2D with dielectric diagonal for refractors, for binoviewer or 1.25"/2" eyepiece use, closeout  Our Product #:  PSDR2D In Stock:  Usually ships within one business day. New closeout. This multifunction star diagonal for refractors has dielectric coatings for 99.4% light transmission and instantly switchable optics to give you up to seven separate magnifications from a binoviewer or a 1.25” or 2” single eyepiece . . . [ More details . . . ]  $599.00 $719.00 SAVE: $120.00 (16%) Add to comparison list View comparison list x   JMI - 2" focuser to SCT rear cell adapter  Our Product #:  AD2SCT JMI #: ADPT2THREAD In Stock:  Usually ships within one business day. This adapter converts a 2" focuser drawtube to a standard Schmidt-Cassegrain 2" rear cell thread . . . [ More details . . . ]  $39.00 Add to comparison list View comparison list

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