I would assume the thickness of the material used for the pinhole would
contribute to vignetting? If so, then thin material, or a wedged shape
hole would be best? We have a laser on a microscope in the lab that
could probably make a pinhole, may take a while. Where would I get some
really thin material?
Second question. I would assume that using an OM-2 or OM-4 would not be
good to use for 10+ minute exposures, as it would drain the camera
batteries, even on bulb?
Wayne
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