Archived posting to the Leica Users Group, 2001/11/23
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]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. I've had my DR (ser#211XXXX) since new in 1967. I haven't had to clean it often, but on the occasions when it required, I have used Kodak lens tissue and, less often, the Kodak lens cleaning fluid with the tissue. I've never used any other tissue or cloth of any kind. My front and rear lens surfaces still look like new. If the lens becomes dirty, first use an air bulb to blow any loose schmutz off. I don't like the aerosol cans as they direct a very strong blast of compressed air that might lodge foreign specks in places it oughtn't be. Then, unless there is clearly foreign matter clinging to the surface, I breathe on the lens to put light moisture on it and gently rub it clean with lens tissue, starting in the center and working toward the perimeter in a circular motion. If more needed, do not put cleaning fluid directly on the lens - it will flow to the edges and make the cleaning job very difficult. Moisten the lens tissue with fluid and do the center to perimeter circular bit. If someone on-list has different experience with the early, softer coatings, it may be useful to readers. Best, Seth LaK 9 - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html