If you want to shoot landscapes you want to have a huge/sharp DOF, so as much as possibly is sharp. So therefore you will shoot at low aperture - example f/8 or more/lower. (Please forget the diffraction a little for this question). But there is a balance between the aperture and the resolution. Just for the example I have chosen the Nikon 70-200 VR at 70mm (and it is wonderfull sharp on a D200, so I would use it for scapes at 70mm). Look here at photozone: http://www.photozone.de/nikon--nikk...mm-f28-g-if-ed-vr-review--test-report?start=1 You will see, that the resolution is best at f/5.6 and lower resolution at f/8, but the DOF is better for scapes at f/8. So you get a better DOF, but lower resolution, by changing the aperture from 5.6 to 8. That will say: At f/8,0 there is better DOF, but the resolution is lower. My question is: Where are the balance - can you say something about that.?? I usually find out where the best resolution of my lenses are and shoot at that aperture, well, maybe a little lower, but I am in doubt if that is right, because I get a better DOF stopping more down. I am here thinking about large prints of scapes.