To do that you have to do some focus testing as I described in the article HERE. Well, you have to be sure that the lens is focusing properly. So you have the camera on a tripod, what's next. If the shutter speed is high enough and your hands are steady enough, you may get a critically sharp image, but don't bet on it happening every time. Photographers don't realize that hand holding a camera (even if it or the lens has image stabilization), isn't the way to get the maximum possible sharpness. Well, unless you're shooting a static subject with the camera and lens on a tripod, it probably doesn't mean much. Probably the most frequent complaint or cause for concern about a lens is that it's not sharp, but what does that mean? Part 6 - Lens Testing for Resolution, Chromatic Aberration and Distortion
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