Archived posting to the Leica Users Group, 2001/04/17
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]> The bottom line, concurrent with Marc's summary. None of this matters one > iota. And if it did, you would not own a Leica M, Hasselblad 500 > series, LF > lens with shutter, etc. Which Leica M lenses have lenses with shutters? I'd be curious if you happen to have the acceleration curves and/or the open/close times for any leaf shutters? That would certainly substantiate or refute the claim that it doesn't matter. My understanding that this phenomenon does matter is apparently standard knowledge, and has been discussed extensively on the Rollei and LF lists. > As a sidebar, I have an R4sP when tested by Ernst Hartmann, showed 100% > shutter accuracy from 1sec to 1/1000th. It is almost impossible to accurately measure a leaf shutter at high speed, with reasonable tolerance, without some very exotic equipment. In order to accurately measure a leaf shutter at high speed, you would have to measure intensity assigning some threshold for 'open', or somehow measure only at the edge. Do you happen to know what equipment he used to make these measurements? The claim "100% accuracy" has me curious too...since I've tested hundreds of shutters, I've never seen one "100% accurate" at even one speed. The are always off by some small percentage, and of course, it depends on how much precision your measuring equipment has. I don't want to get into a pissing contest with you, so don't make it one. I would like you to substantiate your claims. I don't care if you're right or wrong, but if you are right, I'd really like to understand why, because there are many people I know who claim just the opposite...and some of them are professional optical engineers.