The following are important factors in assessing the optical quality of a lens:
-A good lens has the same sharpness in the center as it does at the edges (bad-quality lenses have a corner softness).
-Good lenses can also capture with sharpness at any focal length and at any aperture setting (except when it exceed the diffraction limit or at a very small aperture).
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Related Photography Ideas for what is good lens at OneSlidePhotography.com
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