From DXOMark: More pixels offsets noise3

Started May 30, 2009 | Discussions thread
Steen Bay Veteran Member • Posts: 7,418

John Sheehy wrote:

Steen Bay wrote:

I actually wondered a bit about that, because 40D only has ISO 3200
when "H", "ISO expansion" is activated. Is ISO 3200 a 'real' ISO on
40D, or just a 'pushed' ISO 1600? Doesn't that make a difference?

The actual exposure is what makes the real difference.

The 40D shot is 1/400 and the 50D shot is 1/500, so, unless something
in the setup gave different illumination, the 50D may be exposed 1/3
stop less.


Yes, that would be a disadvantage for the 50D, but the brightness level seems pretty much the same. If anything the 50D image actually seems a tab brighter. But suppose it's possible that 50D uses a different tonecurve.

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