5d Mark III low iso poor performance.

Started Jun 20, 2012 | Discussions thread
schmegg Veteran Member • Posts: 5,768
Re: Take it back

MayaTlab0 wrote:

John Sheehy wrote:

4) On Canon DSLRs with 1/3-stop ISOs, other than the 1D cameras and the original 5D, ISOs like 160/320 are just 200/400 over-exposed, and ISOs like 125/250 are just 100/200 under-exposed, making this latter group show off the banding and high noise floor even more.

Does this correspond to what one can see on this graph (The D800 curve is straightforward, while the 5D MKIII curve goes up and down) ?

Yes - exactly

Is it possible on Canon cameras to force auto ISO to use only the optimal stops ?

No. Auto ISO can uses whole stops or third stops. The choice is selectable. The difference in the final image is marginal at best and should tell you something about the magnitude of relevance that these lines have to your final images.

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