Börje Norhager Posted March 3, 2021 Share #1 Posted March 3, 2021 Advertisement (gone after registration) Is the M4 shutter sensitive to cold weather? I just have developed a Tri-X b/w film, and some frames taken outdoors a bright snowy day, using my Super Angulon 21 mm f3.4 lens, and shutter speed 1/1000 at f8 or f11, the developed negatives show a fairly large part that is definitely darker on the left side of the image. Is the shutter curtain lagging? Logically to me, a shutter curtain that is “decelerating” and is lagging towards one side due to cold weather and lack of lubrication, would result in a brighter part of the image...not darker! Do I think wrongly? The results that I have got, a darker negative part would indicate to me that the shutter is accelerating substantially towards the end position. Right? To further illustrate the problem I enclose a scanned negative, a film scanner Minolta Dimage Dual Scan III and VueScan software. Other images taken another day in warmer weather and/or slower shutter speeds resulted in problem-free images. Has anyone experienced this? My M4 is from 1975, in a very good condition otherwise. You help and advice would be highly appreciated! /B 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! 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/318552-m4-shutter-problemdelay/?do=findComment&comment=4152830'>More sharing options...
Advertisement Posted March 3, 2021 Posted March 3, 2021 Hi Börje Norhager, Take a look here M4 Shutter problem/delay. I'm sure you'll find what you were looking for!
giannis Posted March 3, 2021 Share #2 Posted March 3, 2021 This is usually called shutter capping. The first curtain lags a bit at some point towards the end, and because the slit is very narrow at top speed, the second curtains catches it and for a part of the frame they're stuck moving together. Cold weather exacerbates it, but shutter capping can happen in normal weather as well, especially in old cameras. Usually it means it's time for a shutter CLA, mostly cleaning up old gunk, replacing the lubrication and adjusting the tension. Link to post Share on other sites More sharing options...
Börje Norhager Posted March 3, 2021 Author Share #3 Posted March 3, 2021 Thanks, Giannis! Good to know - a CLA is apparently necessary! /B Link to post Share on other sites More sharing options...
madNbad Posted March 3, 2021 Share #4 Posted March 3, 2021 It's the forty five year old lubricants that are affected by the cold. Link to post Share on other sites More sharing options...
philipus Posted March 5, 2021 Share #5 Posted March 5, 2021 Ah that explains why my knees are freezing up in the cold then PS. Hej Börje, kul att se en till svensk här On 3/3/2021 at 8:52 PM, madNbad said: It's the forty five year old lubricants that are affected by the cold. On 3/3/2021 at 7:41 PM, Börje Norhager said: Is the M4 shutter sensitive to cold weather? I just have developed a Tri-X b/w film, and some frames taken outdoors a bright snowy day, using my Super Angulon 21 mm f3.4 lens, and shutter speed 1/1000 at f8 or f11, the developed negatives show a fairly large part that is definitely darker on the left side of the image. Is the shutter curtain lagging? Logically to me, a shutter curtain that is “decelerating” and is lagging towards one side due to cold weather and lack of lubrication, would result in a brighter part of the image...not darker! Do I think wrongly? The results that I have got, a darker negative part would indicate to me that the shutter is accelerating substantially towards the end position. Right? To further illustrate the problem I enclose a scanned negative, a film scanner Minolta Dimage Dual Scan III and VueScan software. Other images taken another day in warmer weather and/or slower shutter speeds resulted in problem-free images. Has anyone experienced this? My M4 is from 1975, in a very good condition otherwise. You help and advice would be highly appreciated! /B 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! Ah that explains why my knees are starting freeze up in the gold then PS. Hej Börje, kul att se en till svensk här Link to post Share on other sites More sharing options...
Hintsalae Posted March 6, 2021 Share #6 Posted March 6, 2021 Hi! My M5 had similar problems. It got fixed by tensioning second curtain spring by couple clicks tighter. But If that doesn't solve the problem it's time for CLA. I'm not a professional, but professional gave me this tip. Link to post Share on other sites More sharing options...
Graham (G4FUJ) Posted March 6, 2021 Share #7 Posted March 6, 2021 Advertisement (gone after registration) 22 hours ago, philipus said: Ah that explains why my knees are freezing up in the cold then Glad I'm not alone in that 2 Link to post Share on other sites More sharing options...
Börje Norhager Posted July 3, 2021 Author Share #8 Posted July 3, 2021 Am 5.3.2021 um 14:28 schrieb philipus: Ah that explains why my knees are freezing up in the cold then PS. Hej Börje, kul att se en till svensk här Ah that explains why my knees are starting freeze up in the gold then PS. Hej Börje, kul att se en till svensk här Så hur gör man då ett oljebyte? På de snart 50-åriga smörjmedlen i kameran? Ha det bra!! Link to post Share on other sites More sharing options...
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