Archived posting to the Leica Users Group, 1999/03/01
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]> > 3) Purists argue that a UV filter decreases lens sharpness/contrast. By how > much? Has anyone actually taken side by side photos which effectively > demonstrate the increased flare / decreased sharpness.? Yes, I did in college....in a photo-physics course (yes, they really exist) No, there was no discernable difference with/without in sharpness (50 summicron, tiffen single coated UV)....used 50x microscope, navy test pattern, center and edges....no, no MTF data....that's for designers, I'm a photographer..... Just like there's no PHOTOGRAPHIC difference in lenses from l970 and today... By photographic, I mean that shots taken at the same time/same place, on 100 print or E6 or tri-x, handheld, etc.....there's no difference.. No, there's no visible photographic difference in sharpness under real-world conditions with/without clean UV filter.....there may be in contrast due to flare, but only under certain conditions, i.e. BRIGHT light source in picture, strong oblique lighting w/o hood, etc... Like 75% of the "data" presented on the LUG, it's dogma, not photographic evidence......again, although he's probably pissed enough, Erwin's findings are undoubtably true, and valid for designers.....but to the photographer, discussions of bags or flash techniques are infinitely more valuable.... Walt > > OK, I have the flame retardent Nomex cover on the keyboard. Go for it. > > Tom > >