I shoot landscape at f/16 unless some external factor gets in the way.
Could you perhaps share a sample so we could pixel-peep it a bit?
thanks a bunch.
I'd be happy to. I'm not sure if I can upload a full-res image here, but I'm going to try. This is an interior, shot with a 1-D Mark II at ISO 100, Sigma 12-24 lens at 12mm, 1/8 sec at f/14. It was processed from the original RAW file using Adobe Camera Raw, with no sharpening and no C.A. adjustments at all.
I did a little capture sharpen in Photoshop.
It shows a little barrel distortion, but that's easily corrected in software. The corners are very sharp, and what amazes me the most is the lack of color fringing on the hand rails in front of the window at left. My 16-35/2.8L II lens has huge magenta/green color fringing in this same situation. I had to save it as a medium quality jpeg to get it to upload.
BTW, lots of people complain about "brick wall tests" -- testing lens sharpness using a brick wall. But in my job, I have to shoot lots of brick walls, and I like the corners to be sharp, too.
Hope this works, we'll see.