F7.1-F9 yield good results, the other apertures are a bit iffy.

However, this lens produces great results

The results I got were always great in overall contrast but seemed to lack microcontrast, not that anyone I've said this to agreed!I eventually part exchanged it for a wide prime.

That being said, when there's no clouds in the sky, this lens is a blast to use and produces amazing results

I use it mainly for architecture, street photography and social events, and the results are excellent

Don't get me wrong, this is an excellent lens and you will experience great results with some practice

I have used the 77mm Nikon CP II filter on it with nice results

I tried it on my D7000 with good results

Great results with D600.

I needed to increase my shutter speed to 1/15 before I could get better results with the 17-35mm.

It is a very sharp lens and when properly matched with the right subjects, produces very impressive results.

It is VERY sharp, sharp enough that I will shoot it at any aperture, at any focal length, and not be at all concerned about whether the results will be satisfactory.