R3 can focus stack with flash but R5 can't ?

[VivaLaDio]

TIL that R3 can focus stack (bracketing) with flash , i already knew that R5 can't, and that if you do want to use it as a feature, you need continues lights.

how does this make any sense ? Is it just me that thinks that this feature is much more suitable for the R5 and not the R3 ? are people shooting products and architecture with the r3 instead ?

is it a physical / technology limitation ? i'm honestly a bit confused and quite pissed off at the moment.

here's the camera manuals on focus bracketing that shows the R3 can do flash

Canon : Product Manual : EOS R3 : Focus Bracketing

vs the R5 that can't

Canon : Product Manual : EOS R5 : Focus Bracketing

........................

also thanks to 30 thousand youtubers that compare cameras but don't mention these types of features

 

[neuroanatomist]

Focus bracketing uses electronic shutter. The R5 cannot use a flash in electronic shutter mode, the readout speed is too slow. The R3 has a stacked sensor that yields a readout speed fast enough to use flash with electronic shutter, so it can use the flash for focus bracketing.

The R5 II has a stacked sensor and will be able to use flash with electronic shutter (at a max sync of 1/160 s). Most likely, the R5 II will be able to focus bracket with flash.