My Canon glass isn't so hot on the 1Ds Mk. III...

Started Feb 2, 2013 | Discussions thread
jckk Regular Member • Posts: 157
Have you checked AF accuracy?

It could be that the focusing is off so you have to stop down to f8 to get the target within the dof and look sharp.  Like you said, the corners will be softer on full frame vs. crop, but it shouldn't be that drastic and the center should still be similar to your 30D.  The two cameras have similar pixel densities so the 1DsIII is not putting extra stress on a pixel basis.  See if MA helps.

I have the 100mm f/2, which has the same reviews and characteristics as the 85mm f/1.8, and also have the 17-40.  Neither lens requires stopping down to f8 to get acceptable results on my 5D.

Can you post some examples?

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