Originally posted by thechumpen Interestingly I have just tried with my 18-55 set at 18 and this gives pretty much the same thing. Maybe I am just expecting too much
I don't own the lens, but I will add my $0.02 to the discussion. A common complaint with wide angles is that they are not sharp. A common problem is that the photos taken with them are simply out of focus. The short focal length does provide greater DOF, but in practice that means very little if you are going to pixel peep. After all, magnification of the final image is part of the DOF equation. Ultimately, there is only one true point of focus regardless of focal length and if you miss it...
Translation...focus accuracy still counts if you want the photo to be sharp.
Problem...it is very difficult to attain accurate focus with an ultra-wide. Everything is so "teeny" in the viewfinder that it is hard to tell what is and is not in focus. To make things worse, many wide angle lenses have very short focus throws.
Solution? If you are going to be picky about sharpness, use the focus aides on a decent aftermarket screen -or- use a focus loupe in live view. Focus on the near aspect of your subject and let the background take care of itself. In PP, make a careful assessment for lateral CA and correct if your tool is capable of doing that chore. Lateral CA causes global loss of sharpness and is often present.
One other thing...when doing tests for lens sharpness, use a flat target parallel to the plane of focus. The old rule of thumb is to do this at a distance 20X the focal length for 35mm film or 30X for APS-C. This may not be practical for 14mm, but I think you get the gist.
Steve