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24-70mm f/2.8L II or EF 24-70mm f/4L IS or EF 24-105mm f/4L IS at F9

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Rotrypwr:
I see continual comparisons between the canon 24-70mm f/2.8L II, EF 24-70mm f/4L IS and the EF 24-105mm f/4L IS but they are all shot at low apertures.  I shoot a lot of landscape photography and would like everyones advice on the sharpness of these lenses around F9 or F11.  Will I notice much of a difference at this aperture between any of these lenses?

Drizzt321:
Without doing some research, I'd guess that the 24-70 f/2.8 v2 will be sharpest, however all 3 should be pretty good. The other bits you need to look at is CA and distortion. At the wide end, the 24-105 has a good bit of distortion. It's correctable, but you lose some resolution with that. Honestly, if I were doing landscapes (haven't done much), I'd look for some primes. the 24L, 35L, 17 or 24 TS-E. Maybe the 14L, depending on how wide you need to go.

robbymack:
 Little to no perceptible difference at that aperture would be my guess.  Are you printing very large?  I'd say maybe beyond 12x18 you may be able to tell but it's still likely going to be slight at best.

Z:
Quick comparison of the 24-70 f/2.8 II vs. the 24-105 at f/8:

http://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=787&Camera=453&Sample=0&FLI=0&API=4&LensComp=355&CameraComp=453&SampleComp=0&FLIComp=0&APIComp=3

Summary: Slightly more CA and slightly less sharpness with the 24-105. Likely to be indistinguishable in real world viewing.

Dylan777:
If you only shoot f9 to 11, then 24-105 might be a better choice. Lighter, cheaper and more reach.

My 2 cents: I like 16-35 for landscape ;)

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