Archived posting to the Leica Users Group, 2001/01/17
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Dante A. Stella jotted down the following: > Think of the 200 parts in an M rangefinder. Add up all of the individual > tolerances. > Yeah, but some are positive and some are negative and so they balance each other out to some degree. Besides, there must be a tolerance for the focal plane too: it can move back and forth by some (small) measure and we will not be able to see the differance in the negative/print. As long as the individual tolerances balance out to within this range, then everything's fine. Which, I'm assuming, is standard mechanical engineering practice. > If you think otherwise, mount a very heavy lens on a rangefinder. Line up > infinity. Flip it upside-down. Notice anything? So what, don't use a Leica M in microgravity? How many people do you know who use their rangefinder cameras upside-down? > -- Finally, any combination of the above. This is the "system tolerance." But isn't the job of factory QC and aftermarket CLA to ensure that the "system tolerance" is within spec? I think the solution is simple. Grab a camera and one lens. Grab 20 rolls of film. Walk the streets for 10 hours. Take pictures. M. - -- Martin Howard | Visiting Scholar, CSEL, OSU | What boots up must come down. email: howard.390@osu.edu | www: http://mvhoward.i.am/ +---------------------------------------