Shooting RAW, DXOMark, what settings for Auto-ISO.

Started Dec 2, 2011 | Discussions thread
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gava Senior Member • Posts: 1,032
Shooting RAW, DXOMark, what settings for Auto-ISO.

So lately I have been shooting RAW again with the X100.

And I think Auto-ISO is great. I can set my minimum shutter speed at 1/60 and then go into A-priority and let the camera take care of exposure.

Read this page...

What I first took away from that is that when shooting RAW one might as well set the maximum ISO=1600 (measured ISO=1000), because it's never going to go higher than that anyway.

But then it occurred to me that by setting it higher you can underexpose and push and still get the camera to choose a shutter speed appropriate to the situation and avoid motion blur and take the hit on the noise. Just push in LR as appropriate.

Which is better?

ISO1600 1/15 f2 use max ISO and take a chance on motion blur.
ISO3200 1/30 f2 push it a stop in post and avoid motion blur.
ISO3200 1/60 f2 push it 2 stops in post and avoid motion blur.

All lead to loss of resolution.

I honestly don't know what the right thing to do here is. Some experimentation is in order perhaps. I do know that I was shooting with my 5D2 last weekend and I was absolutely shocked at how quickly an ISO800 file fell apart in the shadows compared to the X100.

I'm not sure what to think, but I have just gone into my camera and turned my minimum shutter speed down from 1/60 to 1/40.


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