Archived posting to the Leica Users Group, 1998/06/06
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]<< surely the influence of the lens design would play a much greater factor than the focal length ? (this talk of APO lenses for instance, if the lens is "non-APO" then there would be a color cast along the edge (thereby broadening it) ? and i don't see APO short-focal-length lenses, so is it axiomatic that short focal lengths don't require color correction in the same way long-focal-length lenses require it ?) >> You are correct. Short telephoto lenses are the least difficult to design. One does not need to be as concerned with the apochromatic design of lenses shorter than about 80 mm in focal length. While the laws of physics / optics still apply to these lenses, the effect of chromatic aberrations are less easy to detect.