I'm being forced to work with a shutter that jitters (e.g., a 1/60 shutter could be anywhere between 1/59 and 1/61). I can't change the hardware, so please don't suggest that. I would if I could.
Say I need to take multiple photos of the same scene with the same aperture, ISO, and this jittery shutter. What is the fastest shutter I can use before the jitter will produce a noticeable difference in brightness? No, I can't post-process.
Should I limit the jitter to 1% of total exposure? 5%? 10%? When will people start to perceive the difference? It's not so easy to test this directly because I can't capture an image and precisely measure the actual exposure.