Archived posting to the Leica Users Group, 1997/09/25
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]At 10:34 PM 24-09-97 -0500, Eric wrote: [snip] >Actually, some high diffraction, low and anomalous dispersion glass is very >soft. Optical glass for the most part is pretty soft, but those are >especially. (Some of them). And they can be scratched very easily. One must >be extremely careful not to ruin the front element's coating, because once >it is, not only is the dollar value much less (no biggie for most users) >but the performance degrades. > My Minolta APO 200/2.8 came with a clear 72mm filter which is to be kept on the lens at all times, to protect the soft front element. Dan C.