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Yes, for me that's a negative point of the A7r. Unless it's an inherent limitation of that 36Mp. sensor, I don't see the reason why Sony has crippled this feature. A shutter with electronic first curtain has several pluses : - Almost no firing delay - No vibrations induced by the first curtain closing and opening - Much less noise ( 3 'slaps' instead of one ).
I see also that the flash syncr, speed for the A7 is, as expected, 1/250" but only 1/160" on the A7r. That means that the shutter of the later is much slower. 1/160" syncr, speed is not what you'd expect from a a 1/8000" shutter. I suspect that it's really a normal 1/4000" shutter and the 1/8000" speed is reached narrowing more the gap between the two curtains.
Anyway, a slower shutter means less noise. I'm curious to hear comparisons between both cameras ( without electronic first curtain enabled in the A7). In all logic the A7 should be louder
Of course, with electronic first curtain enabled the A7 must win because there's only one 'slap' instead oh three.