- Photographic version with removable 2" stop ring, can be used either with T2 (M42x0.75) or M48x0.75 connection - Coma corrector for Newtonian telescopes, which does not extend the focal length of the telescope and does not reduce the field of view - Large lenses for completely vignetting-free images up to f/3.5 - Highest sharpness performance over the entire field of view - Phantom Coating - Group multi-coated for maximum transmission and freedom from reflections