Reason for slow flash sync speed

Started Mar 13, 2014 | Discussions thread
le_alain Senior Member • Posts: 1,939
Re: Reason for slow flash sync speed

dotborg wrote:

le_alain wrote:

dotborg wrote:

The A7 has 1/250s sync because it has electronic first curtain.

No, even if you use the mechanical first curtains.

Let me put it a different way: Because the A7r lacks electronic first curtain capability, Sony had to slow down the shutter movement in order to minimize the vibration. This lowered the sync speed from 1/250s to 1/160s.

Hope that makes it more clear.

I did the try with my A7 set at 1/250s and flash on a white wall.

with e-curtain, and with mechanical first curtain.

Both pictures are the same, and you don't see the second curtain on both.

On my A7, mechanical 1/250s synch work.

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