There is a well-known way to test the shutter speeds of a film camera:
It involves using the film camera body as an "external shutter" for a digital camera with a lens. So you can take test pictures with the shutter of the digital camera and then compare the brightness of the pictures with those taken with the shutter of the film camera.
The distinction is whether you place the front of the film camera body or the back of the film camera body in front of the digital camera lens.
I prefer to put the front of the film camera body in front of the digital camera lens. I also use a reverse "macro" adapter/ring to couple the film camera and lens together.
I don't change the aperture during testing. Faster speed is used with higher ISO.
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