Wide 90 degree angle: You can view correct image from refractor telescope stand and just look down with a comfortable angle; protective coating on the mirror to ensure a long life; metal barrel - for secure seating in the focuser
More comfortable viewing orientation as you observe from above; filter thread for any 1.25inch filter; accepts standard 1.25inch eyepieces
1.25inch 90-degree mirror star diagonal for any telescope with 1.25inch connector "not suitable for Newtonians"; useful for refractor and Cassegrain telescopes - not recommended for reflectors
ED Element High-contrast Optics: The first time you observe an object through one of these eyepieces; you will almost certainly be struck by the brilliance clarity and depth of colour in the image
Long Eye Relief Comfortable Observing: The very generous 20 mm of eye relief means your observing is always completely comfortable for all the focal lengths available in this eyepiece series