Archived posting to the Leica Users Group, 2000/08/24
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Well, I've been paying less than no attention to this thread, so if someone's already said this, ignore me. . . . It doesn't matter what color the dot is--it could even be the black shutter curtain they used. The important thing to then do is to calibrate the meter so it gives the right answer, which they do, I guess, since no one's complaining about really horrible exposures. So if it isn't for the specific reflectance of the spot, having determined that this isn't a issue because it can be calibrated out of consideration, what remains? First, the white dot on a black background allows the meter cell itself to be non-selective as to the angle it reads--the angle of coverage of the meter only depends on the size of the spot--the surrounding black is ignored because it's too dark to make much of a difference. Which would you suppose is cheaper--to build a cell that reads a specific angle, and THEN to properly aim it during the assembly process, or to just take a stock cell off the shelf and put a white spot in the right place on the shutter curtain? Second, if you wanted to make a meter that read effectively in the lowest possible light, what color would you use to read off? White, right?--just the same as the trick of reading off a white paper with a hand meter in too-dark situations and juggling the exposure appropriately. - --Michael ________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com