Archived posting to the Leica Users Group, 1996/04/19
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]At 12:21 AM 4/18/96 -0700, Eric Welch wrote: > >On the Apo Macro, it's not an "effect" in the sense that in the case of >the Leica it's not just changing focus the way all lenses do, it is >purposely designed to maintain performance by dropping about 8mm in >focal length as it goes down. Do the other lenses you mention vary that >much? Must be a basic design principle for macros if that's the case. >Interesting. Thanks for the info. > I do not own the lens but most lenses with floating elements do change the focal length a bit when focus, especially at close distance at which the floating elements "floats" more pronouncedly. --------------------------------------- Gang Huang AT&T Bell Laboratories 200 Laurel Ave. 3B-216 Middletown, NJ 07748 U. S. A. (908)957-3524 ---------------------------------------