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So I finally got an arduino + photoresistor set up and it turns out my old Bessa 66 has a slow/gummed up shutter. Like one stop slow from 1/5 to 1/25 and then it more or less stops at 1/30.
Guess I'll still see how that roll of Portra 800 turned out. Supposedly it handles overexposure pretty well.
I really have to think about whether I should risk trying to CLA that cam or send it off. I had good results cleaning a Prontor shutter for an old ADOX Golf, but that one was in pretty shape anyways + the Bessa is way nicer.