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Topic: Unstable image with 16mm camera
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Robert Neia
Film Handler
Posts: 65
From: Palm Springs, Florida,USA
Registered: Aug 2007
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posted January 11, 2017 12:18 AM
Hi Robert and Maurice,
Thank you very much for your inputs. Maurice, I took a look at the video you sent me. It appears I was loading the film incorrectly and this video helped a lot.
Robert, thank you very much for your input. Like you said, the bottom loop is non-existent and the film is running against the pressure plate post. I tried loading the film according to the directions in the video posted by Maurice... what happens is that the top and bottom loops form, but only for a few seconds. After a few seconds, the loops get very tight just as in the video I had originally posted. I'm convinced I'm following the loading directions correctly.
Here are the steps I am taking to load the film:
1. Let the camera run allowing it to take up the film.
2. Once the film moves through the top and bottom loop formers, I stop the camera and thread the film onto an empty reel.
3. I then release the loop formers and start the camera again. Its as if the force generated when starting the camera excessively pulls the film, making the loops before and after the pressure plate tighter.
Does any of what I'm trying to describe make sense? Sorry, I know there is a lot of detail to here, I can try and take another video if that would help.
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Robert Lewis
Film Handler
Posts: 58
From: United Kingdom
Registered: Feb 2009
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posted January 11, 2017 04:03 AM
Robert... I have to say that I am puzzled. The upper and lower sprockets are related and therefore the upper sprocket pushes film forward to the gate and the lower sprocket pulls film from the gate and so unless something goes wrong if the bottom loop is lost, I would expect the upper loop to become larger. Assuming that the pressure plate is properly in place and secured (and looking at your video it appears to be) the claw should be moving the film through the gate at a speed which is consistent with the turning of the upper and lower sprockets, so maintaining the upper and lower loops.
I think Tom's suggestion that you try to establish what is happening if you run at the slowest speed you can (this is probably 12 frames per second) is excellent
From your video, it almost as if the claw is not doing it's job part of which is to hold the film in the gate frame by frame, and instead, the lower sprocket is pulling the film through continuously thereby causing the lower loop to disappear, leaving an upper loop, albeit small, in place. So make sure that the pressure plate is properly installed and try to establish if the claw is working correctly. You could also try marking and measuring the length of film from sprocket to sprocket when you first load the film, and then compare the length of the film sprocket to sprocket after the lower loop has been lost.
One last question ... Looking at the video as closely as I am able, I almost have an impression that the film is loaded with the sprocket holes nearest the film chamber door, but that could be a mistake on my part or you are using a length of film which has double sprocket holes. The sprocket holes on single sprocket film should be furtherest from the film chamber door, and I am wondering whether, if it is single sprocket film, you have it loaded the correct way. It might just worth checking.
Regards.
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