High-quality 2" zenith mirror with dielectrically coated mirror and 99 % mirror coating as well as a surface accuracy of 1/10 lambda. 99 % reflectivity - with a quartz protective coating.CNC housing and short optical path with 112 mm length. When the 2" ClickLock clamp is removed, a female SC thread is available for short adaptations and for direct connection of the Hyperion zoom eyepiece.