The whole question of lens sharpness...

Started Jun 12, 2013 | Discussions thread
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Alphoid Veteran Member • Posts: 3,592
Re: The whole question of lens sharpness...

sjgcit wrote:

This isn't true. You can never fully reverse the many optical effects. You'd be breaking a number of well established physical laws if you could.

Please name one such law.

Even if you attempted this to the limits of physics you'd probably be frustrated by sample variations in the lenses.

True. This is the difference between theory and practice. In theory, given a perfect model of the lens, I can completely undo any blur caused by the lens (although increase high-frequency noise in the process -- which matters a lot at ISO1600, but not so much at ISO100).

In practice, if the model is a bit wrong, you run into numerical instability if you tried to take it too far.

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