Archived posting to the Leica Users Group, 1999/12/07
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]At 5:08 PM +0000 12/6/99, Dan S wrote: >Is is more difficult to create an APO 50 than an APO 90? Would the benefits >be the same for the smaller focal lengths in terms of real world >performance? The things that APO correction takes care of are mostly evident to a significant degree (color fringing) occur in lenses of about 90mm and longer. But aspherical correction works with wider lenses, but not so much with longer lenses. Thus the only APO lens you will see that is also ASPH is the 90. - -- Eric Welch Carlsbad, CA