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.
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).
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.
A premium dielectric coated diagonal which is small and compact with very high quality machining and a super-hard black anodised chassis. Delivers all the optical and mechanical quality you'd expect from a premium diagonal.
Available in either 1.25" or 2" sizes the mirrors inside these diagonals have undergone a special high-reflectivity multi-coating process, allowing them to reflect 99% of the precious gathered starlight, providing exceptional brightness and contrast. (Standard diagonals typically reflect 90-95% of light).