Shutter times in relation to what the eye can see

RalphLambrecht said:

Try to cancel them out?

What if they add up?

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Then you'd have to stamp a very different shutter speed on that setting for your shutter!

When I tested a rebuilt 'front of lens' roller blind shutter (circa 1870ish or something) on the front of an old Sanderson, I was amazed that the shutter speeds seemed to be about right. Now I think about it I reckon the numbers stamped on the dial had little to do with the actual time the shutter opened for... but the resulting exposure was in the right ballpark, so I was happy

steven_e007 said:

Then you'd have to stamp a very different shutter speed on that setting for your shutter! ...

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That works for focal-plane shutters, but keep in mind the timing of a leaf shutter depends on the aperture setting. With leaf shutters, the effective exposure time at small apertures is longer than at large apertures.

RalphLambrecht said:

That works for focal-plane shutters, but keep in mind the timing of a leaf shutter depends on the aperture setting. With leaf shutters, the effective exposure time at small apertures is longer than at large apertures.

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That of focal plane shutters too (though perhaps to a lesser degree).
With larger apertures, the spread to the left and right of the slit aperture will be more than with smaller aperture, thus the exposures will be longer.