A quick search tells me that the MTL3 has a metal vertical shutter so I think you have the answer to why only the bottom of the frame was exposed. Sounds like the shutter is having issues. Definitely not a film processing issue. It probably needs a clean and lube (CLA). Possibly, only some speeds are having an issue.
I'm not familiar with the MTL3 but it was a very popular camera and the metal shutter means it should last much longer than others with a fabric curtain so it may be worth resuscitating. A search online might find if this is a common problem and if there is a DIY fix.
Last edited by Bob; 7th April 2021 at 09:10 AM.
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