Archived posting to the Leica Users Group, 2003/03/18
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Austin That makes four! Jerry Austin Franklin wrote: > Hi Tim, > > > > > It sounds like they described it accurately to me. If the aperture > > > > moves freely I would not worry about it. Oil on the aperture blades is > > > > more of an issue with SLR auto diaphragm lenses. > > > > > > I believe it is a reflection issue...which wouldn't matter if > > > it's an SLR or > > > not... > > > > > > > As with LF lenses in shutters, as well as SLR auto diaphragm > > lenses, it's an > > issue of the oil actually slowing the shutter/aperture diaphragm blades > > down - they should be dry. But on a rangefinder it's not an issue as the > > aperture blades don't move in a leica M lens during exposure. > > you mean "on a range finder THAT PARTICULAR ISSUE is not an issue", because > oil on the blades can very well be an issue. Over time, it can get on the > elements, and it can also possibly cause a haze on the optics. Oil inside > the lense like that is just not a good idea, rangefinder or not. > > > Reflections? Bah humbug. Some of my shutter blades are so old and > > shiny you > > could shave in em! > > Then why do they matte them to make them not shiny? Any internal > reflections can reduce contrast, and/or cause flare. The potential is > certainly there. > > Regards, > > Austin > > -- > To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html