A high -performance correction lens to remove aberration generated by the parabolic mirror. If you shoot with a Newton -type reflective mirror alone, a large frame aberration will occur mainly in the periphery of the field, but by using a collector pH, the star image around the field of view can be taken as a sharp point image.can. * It supports not only photography but also eye viewing.- magnification 0.95 times Focal length (F value) R200SS Large barrel 800mm (F4) → 760mm (F3.8) Coating AS coating (maximum permeability per surface 99.9 %) lens configuration Wynne 3 -group 3 -piece configuration Image Circle 44mm (Cover 36 x 24mm full size) Installation screw standard M56, p = 0.75mm Filter compatible 52mm filter (commercial product) can be installed Compatible lens barrel R200SS Large Bar Eseudo observation Possible (Eyes Lens 31.7mm, Use of Eye Adapter) body size φ56 x length 78mm body weight 175g Country of origin Japan Warranty period 5 years
