D3 and high ISO - IF, WHEN and HOW to use

Started Mar 30, 2008 | Discussions thread
GaborSch
Veteran MemberPosts: 7,203
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They are "genuine"
In reply to greg_thurtle_uk, Apr 7, 2008

greg_thurtle_uk wrote:

Have you analysed intermediate ISO's on the D3 such as 500,640,etc
and determined if they are done by exposing at 400/800 and scaling
up/down in a similar way to the 30d/40d?

I don't have samples with all 1/3 stop ISO steps, but 450, 640, 1250, 2000, 2500, 4000 and 5000 don't exhibit the signs of being numerically derived from the others. I guess this is so for all other 1/3 stop steps.

This is unlike my Canon 40D, which simulates all 1/3 stop ISOs. (Of course, there are a few other differences as well.)

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