Quote: smcook99:It's not a 100% crop but it's not the raw distance either. That is about 30% of the original picture. The yellow hair in the white circle has a distance from the camera, foreground to background of about 1cm. So DOF could not excuse the softness of that "hair". When I can look on the camera's screen and see softness I know there is a problem.
Mark has made some great points. Also, along with non-cropped shots and %100 crops, you could post shots with EXIF data in tact. Or, tell us the focal length used and the precise distance to the focus point. The closer you get to the subject, the shallower DOF is. There is no way you took the above shots at 1cm from your subject. Are you sure your crops are from the focus point?
Quote: smcook99"Please clear up the following though:
Should 2.8 be sharp or not. I've heard testimony of THIS model lens sharp the whole range of the aperture and I've read, as was said three posts up, that I shouldn't expect 2.8 to be as sharp as 5.6
Yes, absolutely, this lens is very sharp wide open--no doubt. Like other lenses though, when you stop down it gets even sharper. But, if you are close to subject, @ 75mm & f 2.8, the DOF will be very, very shallow. Also, if you are closer than the lens' minimum focus distance, there is no way to get sharp pics. I believe the minimum focus distance for this lens is 13 inches, but I'm not sure if that holds throughout the entire zoom range. Be sure to shoot more than 13 inches away from your subject and take crops from the area you focused upon.
Quote: smcook99: Please correct me if I'm wrong in thinking that my lens is erroneously soft.
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