“Theisdesign is a chinese made airspaced achromat, which has rather bad colorcorrection. However even such lenses can have a good spherical correction. if we compare the defocused images on both sides, we see not real big spherical problem and no real turned edge. Beside the obvious chromatic aberrations the images are quite similar This scope is mainly designed for low power wideviews and will do in that area a pleasant job” Markus Ludes (APM-Telescopes) |
