SkyWatcher erect-image prism for Newton optical tube. Barrel size 31.8 mm. Includes 10 mm eyepiece and extension tube 1.25". Allows terrestrial observation with newtonian telescopes.
"This Accessory Photo-Viewing Is Part Of The Focuser 2" "And Allows You To Simultaneously Use Two Eyepieces Diam. 31.8mm Looking Alternately With One Or The Other. Unscrewing One Of The Adapters Is 31.8mm You Can Also Attach A T-Ring For Photographing And Drive With The Other Eye. "
SkyWatcher 45-degree erect-image diagonal, barrel size 31.8 mm. For 31.8 mm eyepieces. Allows terrestrial observation with astronomical telescope. Not suitable for newtonian optical tubes.