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
– I want to create photographs with blurry backgrounds, how do I achieve such a feat? Answer: The trick to doing so has been previously discussed in this post. – I’m using a kit lens and I’ve set the aperture to its widest exposure, how come the background isn’t blurry? Answer:
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