A premium 2" 45 degree prism based diagonal which lets you use your astronomical telescope as a super high quality terrestrial spotting scope with your favourite large 2" or 1.25" astronomical eyepieces. The prism aperture is 31mm therefore the prism is compatible with eyepieces with field stops up to 31mm in diameter. You can check this by looking at the base of the eyepiece. This is the version with the best coatings our prism manufacturer can offer.
Because of the heavy duty casing, the 2" erect image prism is especially recommended for those using heavy bino-viewers during the day-time.