Archived posting to the Leica Users Group, 1999/11/18
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]>>>ASPH lens are much better that is true, but the nature of the animal is that is primarily true on the longer lens. The longer the lens the more spread you get in the visual spectrum of light where as asph and flourite lens tend to make them come to focus at the same point. Love them all, especially the !00mm.<<< Clifton, This is confused. You don't mean ASPH, you mean "APO," shorthand for apochromatic correction, whether effected by fluorite elements, extra-low-dispersion glass elements, and / or extraordinary partial dispersion glass elements. Actually, aspherical elements are most useful in lenses of a wide to moderate angle of view, to prevent spherical distortion at the widest apertures. - --Mike