nic_olas Posted July 15, 2023 Share Posted July 15, 2023 See attached pics, it's a test roll from an F3. The black mark / hazey edges of some shots is concerning. There was a motor drive attached to the Nikon F3 that was removed on / off during this test roll if that could do it? (Nikon F3, 50mm Pre AI lens, MD4 Drive, Kodak Ultra) Thanks! Link to comment Share on other sites More sharing options...
Niels - NHSN Posted July 15, 2023 Share Posted July 15, 2023 Looks like obstruction of some sort, possibly in the upper part of the mirror chamber. Lock the mirror in upper position and remove the lens - anything in the upper area that could obstruct the light? Niels Link to comment Share on other sites More sharing options...
nic_olas Posted July 15, 2023 Author Share Posted July 15, 2023 15 minutes ago, Niels - NHSN said: Looks like obstruction of some sort, possibly in the upper part of the mirror chamber. Lock the mirror in upper position and remove the lens - anything in the upper area that could obstruct the light? Thanks, looks pretty good in there. Nothing obvious. Some shots come out fine, same day, same lens etc Link to comment Share on other sites More sharing options...
Niels - NHSN Posted July 15, 2023 Share Posted July 15, 2023 (edited) I am fairly sure the culprit is obstruction of light. It cannot be directly in the film gate as the edges would be more defined. The repeated pattern out-rules the accidental object in front of the camera. You are a better judge of what may possibly have happened during the shooting (case, strap, bend rubber hood etc.) Possibly try to shoot at slow speeds why looking through the film gate to see if something is obstructing intermittently. Edited July 15, 2023 by Niels - NHSN Niels Link to comment Share on other sites More sharing options...
Niels - NHSN Posted July 15, 2023 Share Posted July 15, 2023 On further reflection, the edge looks so fuzzy that I am inclined to suspect something in front of the lens rather than behind. Niels Link to comment Share on other sites More sharing options...
nic_olas Posted July 15, 2023 Author Share Posted July 15, 2023 As far as I can remember, the lens was clear in the viewfinder at the point of taking. A blocked lens I would have likely seen before taking the shots. If it helps here's a contact sheet of the roll, most shots are fine, only these two and some light leaks here and there... Link to comment Share on other sites More sharing options...
Niels - NHSN Posted July 15, 2023 Share Posted July 15, 2023 Ahh - If only present on two frames I think it is fair to assume it is just accidental obstruction in front of the lens. I thought it was a recurring problem. I’d be more concerned about “Some light leaks here and there”. Niels Link to comment Share on other sites More sharing options...
mike_halliwell Posted July 15, 2023 Share Posted July 15, 2023 What's going on around Frame 6>7>8? Film loading failure, sprocket slip? Link to comment Share on other sites More sharing options...
CvhKaar Posted July 15, 2023 Share Posted July 15, 2023 mmm Manual Focusing or handheld by the lens? Small format lens like a wide or 50mm or pancake lens? Looks like the good old pinky in front of the lens during taking the shot? Link to comment Share on other sites More sharing options...
nic_olas Posted July 16, 2023 Author Share Posted July 16, 2023 11 hours ago, mike_halliwell said: What's going on around Frame 6>7>8? Film loading failure, sprocket slip? That was using a motor drive, I think it messed up the film transport and the roll was stuck making the same shot on repeat! Wild looking images! The roll otherwise seems okay! It might be the old 'finger in front of the lens' - hard to do with a SLR and i doubt it, but maybe thats the anomaly if most other shots are good? Link to comment Share on other sites More sharing options...
nic_olas Posted July 16, 2023 Author Share Posted July 16, 2023 Here is the mirror and mirror box, all seems okay aside from the 2nd mirror having crumbly old foam, but not sticky. I'll shoot another roll and see if anything repeats! Link to comment Share on other sites More sharing options...
dennis_sa_mannshausen Posted July 20, 2023 Share Posted July 20, 2023 You wrote that the MD-4 was on and off during the session. Did you mount the small screw-in cap, which covers the slot where the motor drive pins enter the body while not using the motor? Otherwise you might get light entering this way. Link to comment Share on other sites More sharing options...
BeBu Lamar Posted July 21, 2023 Share Posted July 21, 2023 On 7/20/2023 at 1:48 AM, dennis_sa_mannshausen said: You wrote that the MD-4 was on and off during the session. Did you mount the small screw-in cap, which covers the slot where the motor drive pins enter the body while not using the motor? Otherwise you might get light entering this way. But the mark wasn't caused by light leak though. Link to comment Share on other sites More sharing options...
nic_olas Posted July 22, 2023 Author Share Posted July 22, 2023 (edited) SO! A 2nd test roll back and there are no mysterious black marks like the previous shots. I think, and awkward to say, it may have been a finger/strap/anomaly in the last roll. Nothing like this on the second roll, varying speeds. It likely would have shown up at least once if it was the mirror etc? If that's good, woo-hoo! The next step is a light tight body. I have redone all the back door seals. I have tape over the MD cover for now. Do any of these leaks look like they're coming from elsewhere on the body? The appearance is sort of a red / brown fog at the egdes and some trouble in bright light / the sun. Thanks for all the input everyone. Edited July 22, 2023 by nic_olas Link to comment Share on other sites More sharing options...
BeBu Lamar Posted July 22, 2023 Share Posted July 22, 2023 Did you lose the MD cover? Link to comment Share on other sites More sharing options...
nic_olas Posted July 22, 2023 Author Share Posted July 22, 2023 7 hours ago, BeBu Lamar said: Did you lose the MD cover? It came with the MD attached, but no cover. I 3D printed a little button cover for another F3 I once had, I should do this again... Link to comment Share on other sites More sharing options...
robert_bowring Posted July 23, 2023 Share Posted July 23, 2023 Take the motor drive off of the camera. If I remember correctly there is a storage slot for the screw cover in the motor drive. Your cover may be in there. Link to comment Share on other sites More sharing options...
BeBu Lamar Posted July 23, 2023 Share Posted July 23, 2023 The storage slot is in the battery holder. Link to comment Share on other sites More sharing options...
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