Matt Grum
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 Re: Pre-order: Sony A9 | |
artur5 wrote:
The "readout time" of mechanical shutters is not the flash sync speed. It has to be considerably shorter.... For cameras with a sync of 1/250" the curtains must travel in 1/500" or less.
I mentioned earlier in the thread that mechanical shutter transit times are faster the sync speed, but I don't think the difference is as great as you suggest. Sync speeds are quite aggressive, the t0.5 duration of an SB800 on full power is 1/1500s, so at full power you could juuust sync at 1/250s with a 1/300s transit shutter, though some of the frame would catch more of the tail, so 1/320s would be safer.
If the A9 scan time is indeed 1/160s then it's probably around half a stop slower than the 6D.
artur5 wrote:
It's easy to test it with an analog oscilloscope. I did with my A7rII and it's certainly 1/12". I also tested the speed of the mech.shutter and its around 1/300-1/320", so with manual flashes near at full output, you can't use 1/250". Even 1/200"·is quite tight.
Did you test any other manufacturer's mechanical shutters? I imagine the consumer models would be similar.
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