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Nov 2, 2022 at 15:55 comment added Zeiss Ikon Okay, I couldn't (quickly) find a picture of the OM-4 shutter. If it's horizontal, then my edit (in my own answer) about non-parallel curtains and curtain drag may apply.
Nov 2, 2022 at 14:45 comment added Steadybox @ZeissIkon There's at least a few horizontal shutters that go up to 1/2000. Fujica ST801 has one. So does Mamiya 2000 DTL, and apparently Olympus OM-4 as well.
Nov 2, 2022 at 13:31 comment added Zeiss Ikon Sometimes a shutter that needs cleaning and adjustment can (especially at very high shutter speeds) either lag on opening (leading curtain starts slow) or cap before it finished traveling (leading curtain gets drag late in travel). That won't produce the curved edge, however -- it'll be straight, even if slanted by uneven drag. And as noted, then only with a horizontal shutter; few if any shutters that go above 1/1000 top speed are horizontal.
Nov 2, 2022 at 13:05 history edited Kai Mattern CC BY-SA 4.0
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Nov 2, 2022 at 12:57 history answered Kai Mattern CC BY-SA 4.0