Astromania 1.25" 45-Degree Diagonal Prism Optical Prism Inside Rather Than a Mirror which Makes Your Image ar and Sharp

High quality optical Prism inside rather than a mirror which makes your image clear and sharp More comfortable viewing orientation as you observe from above, filter thread for any 1.25 inch filter; accepts standard 1.25 inch eyepieces Protective coating on the mirror to ensure a long life; metal barrel for secure seating in the focuser This is a great diagonal for daytime terrestrial use and night time astronomy applications for telescopes or spotting scopes 1.25 inch 45 degree mirror star diagonal for refractor telescopes with 1.25 inch connector and not recommended for reflectors