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Thanks all. Good info. I knew I came to the right place.

Another good thought. I did try the sensor of center to the shutter for most of the tests, but I'm not sure the it would make much of difference. A glance at patent diagrams on the old google show...

Thanks for the thought. What I'm describing as peaks are really two plateaus with a valley between them. The shutter is all the way open at the start of the plateau and closes at the end of it,...

I recently inherited a lovely Rochester Optical Co. Elite 5x8 with a Prosch Duplex. I've tried to check the shutter times using a couple of different methods: the "Arduino shutter speed tester...