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Question about old films . . .


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I'm not sure if anyone can answer this, and I'm not sure I even know how to describe it - or if there is a term for it.


Sometimes when you watch movies on an old film projector, the image will seem to "drop" for a second. I'm not sure if it's the film slipping as it goes past the lens.  Or maybe the speed isn't constant?  Does anyone know what the hell I'm talking about?  Is there an explanation for this?



Edited by toymaker
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From what I understand, the most common causes of film projector slipping are  momentary changes in tension (which can usually be resolved through lubrication of mechanical components) or flaws in the film's side notches.  :smile:

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