Rolling/electronic shutter vs mechanical shutter?

Started Sep 24, 2022 | Questions thread
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Bikeridr Forum Member • Posts: 76
Rolling/electronic shutter vs mechanical shutter?


Apparently I've been registered earlier here as I got message of an existing account while registering. When resetting the password, now the forum indicates I registered today.
Anyway, been "lurking" (and apparently been a member) since 2004, and now I have a question.

I am just curious about the difference between the electronic vs the mechanical shutter.
My Canon EOS R5 ( migrated from Canon EOS 20D, via 5D Mk II to R5) can choose between electronic and mechanical shutter. Shutter speed is the same in both (max 1/8000th of a second).

How come the rolling shutter gives bent lines or variations in the light d.t grid frequency while the mechanical doesn't?

I know that the mechanical shutter "rolls" over the sensor during exposure while the electronical "reads and records" each line during exposure.

Shouldn't the mechanical shutter also give the "rolling shutter" artefacts as it still travels over the sensor?
When shooting with flash and deliberately exceed the sync speed, one can see the mechanical shutter blocking part of the image as first curtain opens and the second curtin follows, making a "slit" over the sensor through the exposure.
How does the readout differ between the mechanical and the electronic shutter?
Also, why does the R5 "reduce" to 12 bit in electronic mode while having 14 bit in mechanical. I'm shooting solely in raw format.

Sorry for the quirky explanation, English is not my native language.

 Bikeridr's gear list:Bikeridr's gear list
Canon EOS 5D Mark II Canon EOS M100 Canon EOS R5 Canon EF 50mm F1.4 USM Canon EF 400mm f/5.6L USM +9 more
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Canon EOS 20D Canon EOS 5D Mark II Canon EOS R5
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