Archived posting to the Leica Users Group, 2001/11/01
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]While reading some lug message from the last week or so I read some comments about scratches on lenses. While scratches on rear elements are probably worse than on front elements, placement of the scratch is very important. I had 150/4 Sonnar with a horrible scratch on the rear element (possibly left by a repair person gone mad with a screwdriver). It never showed up in the least (even at f4). The only time it was ever a factor was when I bought and sold it. It greatly reduced the value of the lens. OTOH, I sold it for what I originally paid for it and I used it for 10-years. (try that with anything digital!) The horrific scratch on the 150 was on the outer third of the rear element, which led me to wonder; in the mystical world of bent light and vectors, just how much of a rear element is actually used. Maybe just a portion of the center? I suppose only a lens designer could answer that. Dave - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html