Archived posting to the Leica Users Group, 2010/01/28
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Hi Aram, Yes, I've measured them. My times coincided to within .001 s with Leica's published times for the M3, M8 and M9, but I can't find what Leica say about the M7 - I've read 0.02 and 0.012 (Erwin Puts stated the latter time). I times the M7s lag within 0.001 s of the figure Puts published. 0.08 s is about 1/13 s - much longer than most exposures. Later, Marty On Fri, Jan 29, 2010 at 2:42 AM, Aram Langhans <leicar at q.com> wrote: >> Date: Thu, 28 Jan 2010 18:42:07 +1030 > > Marty. ?Just wondering. ?Did you measure the lag on the M3, M7 and Nikon D3 > or are these stated times? ?If they are stated times, perhaps the vast > difference is in the measurement technique, and perhaps that is why others > have not noticed any real problem. > > But it sounds like you are a scientist (microscope reference) and have > probably accounted for this already. > > Aram > > > >> From: Marty Deveney <benedenia at gmail.com> >> Subject: [Leica] M9, lag time, perception and other things >> To: Leica Users Group <lug at leica-users.org> >> Message-ID: >> <ee8fa51c1001280012s3456bc6fw80acdc1c4ba7be9 at mail.gmail.com> >> Content-Type: text/plain; charset=ISO-8859-1 >> >> I changed the subject line because I agreed with Steve that the >> previous one was absurd. >> >>> How does one measure 0.08s? >> >> You measure it using a device designed for the task. ?These shine a >> laser in onto a mirror that you attach to the film or sensor plane and >> have a sensor next to the laser outside the camera that detects the >> reflected beam. ?The sensor is also attached to the shutter release. >> There is a very precise chronometer or computer in the middle. ?You >> set it to go, the shutter fires, the chronometer or the computer tells >> you the lag. ?It compensates for shutter button travel by determining >> where the cutoff point lies prior to measuring the lag. >> >>> And this is important because? ?Its only 8 hundreths of a second, who >>> really cares? >> >> Maybe it isn't important to you, but it is to me; I still perceive a >> distict gap between when I pressed the shutter and when the camera >> took the picture - it matters for most of the stuff that I photograph. >> With a mechanical M or an M7 it's almost instantaneous, whereas with >> an M8 or M9 it is not. ?If you don't care, or can't perceive it, then >> it is no problem. ?I can and for me it is an issue. ?It means my M8 >> spends most of its life tethered to a microscope where it's slowness >> doesn't bother anyone. >> >> It matters to some of the rest of us too; take a look in the archive. >> >> Marty >> > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information >