Archived posting to the Leica Users Group, 2001/11/23
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]SthRosner@aol.com wrote: > > Hello Feliciano: > > It may depend on the serial number of your DR. The later series, the ones > with the focussing ring grooves in the indented scallops rather than on the > raised grips, have different coating material. It is supposed to be both > better in terms of light transmission and harder. I'm not certain at what > serial number that started but believe it was in the 1,900,000 series and > later. >Seth That would include mine. The serial number is #192xxxx. The coating looks a little more purple to me than other examples I have seen. >If you get a fingerprint on the lens, it is time to clean it >as soon as possible...acids and oils can permanently etch >the surface. >Regards, Bill Larsen Yep, I've seen that happen. I have a beautiful old set of coated Baush&Lomb 35mm cine lenses (Super Baltar). The 25mm has a nice fingerprint on it, that long ago someone didn't clean off. Eventualy it ate through the coating. In that case it is more of a obssesive/ compulsive/cosmetic problem, since I've never seen it affect the performance of the lens, but then again the print is about 1/4 inch big and the glass is about 4 inches across... > Use just a drop of lens cleaning fluid (I learned this from experience when I destroyed a >lens by having the tissue soaked). How did too much fluid destroy the lens? Did it attack the coating or get inside and lead to problems? >My first DR I had for 5 years and used it hard, no damage. If you are >worried you could always dedicate it to B&W and keep a yellow filter on it >all the time :)) >Don Dory Oddly enough that's pretty much all I shoot and one of the main reason why I bought the DR. Now, the permanent yellow filter is a WHOLE different discussion... ;-) Thanks everyone. Cheers, feli - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html