MerijnvZ Posted May 3, 2016 Share #1 Posted May 3, 2016 Advertisement (gone after registration) Hello all, My M4-2 recently developed some strange issues when used with 1/500 &1/1000sec. shutterspeeds. Any of you who knows what causes it? One can see some light leaking (spockets) on the bottom part of the scan, and of course the strange brushstroke-effecton the left side... I guess its some serious CLA will solve this? Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members! Quote Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! ' data-webShareUrl='https://www.l-camera-forum.com/topic/260073-m4-2-shutter-issue/?do=findComment&comment=3038081'>More sharing options...
Advertisement Posted May 3, 2016 Posted May 3, 2016 Hi MerijnvZ, Take a look here M4-2 shutter issue. I'm sure you'll find what you were looking for!
jaapv Posted May 3, 2016 Share #2 Posted May 3, 2016 It means the shutter curtains do not run smoothly any more. Check if there is some obstruction, like a sliver of film. If not, send the camera in for a CLA and shutter overhaul. 1 Quote Link to post Share on other sites More sharing options...
jerzy Posted May 3, 2016 Share #3 Posted May 3, 2016 There is as well a problem with the first curtain, this is where the black smudges are from. Most probably needs to be replaced 1 Quote Link to post Share on other sites More sharing options...
adan Posted May 3, 2016 Share #4 Posted May 3, 2016 "Brushstrokes" - as jerzy says, an uneven edge to the metal curtain edge. It can be just "crud" that has built up over time, and can simply be cleaned off. If it is nicks or dents in the metal leading edge, then it will need replacement. "Picture fade-out" - the two shutter curtains are not travelling at the same speed aross the film, and thus the slit between them (which determines the timing at high speeds, at x-mm per millisecond) is changing width, and giving a variable shutter speed from one side to the other (effectively a shutter speed of 1/infinity when the curtains are together, down to the "nominal" speed as the curtains match speed and the slit widens). This slo-mo video of a FED shutter (Soviet Leica copy) shows how a sticky curtain will fade the picture in or out across the frame (also shows the metal curtain edges). In this case, the first curtain is slow to accelerate away from the second curtain. My very first Leica (IIIc in college) had the same issue in reverse - second curtain "caught up" with first curtain at the end of the exposure, producing "half-frame" pictures at 1/1000, and fading out the picture at 1/500-1/250. At 1/125-1/60, the slit is much wider (longer total time) so the effect, while still there, is often far less noticeable. Needs a CLA to adjust shutter spring tensions, re-lube the mechanism, and/or perhaps remove some "slack" that has developed in the tapes that pull the curtains. 1 Quote Link to post Share on other sites More sharing options...
MerijnvZ Posted May 4, 2016 Author Share #5 Posted May 4, 2016 (edited) Djeez Adan, Jaap and Jerzy, this is the best help you could give me. Well explained and thourough! Thanks a bunch! I will contact the shop where I bought this camera, it was supposed to be flaw-free. Seems he has something to explain. Edited May 4, 2016 by MerijnvZ Quote Link to post Share on other sites More sharing options...
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