Celestron 90 Degree Star Diagonal 1.25"£28.00
A Star Diagonal brings the eyepiece out at 90 degrees from the telescope tube, allowing comfortable viewing when the telescope is pointed at, or near, the zenith (i.e. directly overhead). The resulting image is the right way up, but is reversed from left to right.
Antares 90° Star Diagonal 1.25"£29.99
Upgrades your existing cheap prism or mirror diagonal (ie the ones you commonly get bundled with telescopes) for vastly improved resolution at the eyepiece.
Meade Diagonal Prism #918A 1.25"£30.00
Star diagonals let you view objects at a 90° angle from the direction the telescope is pointing, which means viewing will be much more comfortable, especially when the telescope is pointing straight up.
Skywatcher 90° Star Diagonal 1.25"£32.00
A high quality 90 degree star diagonal. For use with Refractor and SCT telescopes. Using this diagonal will ensure a comfortable viewing position when using your telescope.
Skywatcher 90° Erecting Prism 1.25"£34.00
This 90° diagonal will provide corrected views on Refractor and SCT telescopes. High quality finish such as chrome barrel and high quality thumb screws for securing eyepieces.
Antares 45° Erecting Prism 1.25"£34.99
45° Erecting Prisms include an internal flat mirror to reflect light to the telescope's 90° astronomical observing position; in this position the telescope's image is upright, but reversed.
Skywatcher 45° Erecting Prism 1.25"£35.00
High quality 45° erect image diagonal. Corrects the image on refractors and SCT telescopes. The 45° angle will provide a comfortable viewing position when using your telescope terrestrially.
Antares 90° Erecting Prism 1.25"£39.99
This diagonal is for astronomers who prefer the convenience of 90-degree viewing but want to view a fully corrected image, ie the right way up and not mirror-reversed left to right.
Meade Erecting Prism 45 Degree #928 1.25"£40.00
This 45-degree viewing angle image erecting diagonal is designed to use 1.25" eyepieces in catadioptric telescopes with a 1.25" visual back or in refractors with a 1.25" focuser drawtubes.
Meade Erecting Prism For ETX 70/80 #933£50.00
This 45-degree viewing angle image erecting diagonal has a knurled ring that threads onto the Cassegrain focus at the rear of Meade ETX60, 70 and 80 refractors only.
Meade ETX Erecting Prism 45 Degree #932£50.00
All ETX telescopes include an internal, flat mirror to reflect light to the telescope's 90-degree astronomical observing position; in this position the telescope's image is right side up, but reversed.
Bresser Messier 2" Mirror Diagonal£58.00
The Bresser Messier 2" Mirror Diagonal - 93% Transmission is very good diagonal mirror for refracting and Cassegrain telescopes with 2" focusers (and for the Explore Scientific and Bresser Messier telescopes with 2.5"- HEX focusers).
Skywatcher 90° Star Diagonal 2"£59.00
High quality 2" star diagonal. Makes observing at high angles much more comfortable when using Refractor and SCT telescopes. Comes complete with the 2" - 1.25" adaptor so you can use both eyepiece sizes with this diagonal.