The whole question of lens sharpness...

Started Jun 12, 2013 | Discussions thread
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Detail Man
Detail Man Forum Pro • Posts: 16,400
Re: The whole question of lens sharpness ...
2

sjgcit wrote:

> It's possible to increase real sharpness. This requires having a model of the way in which the lens is not sharp (not just a 'sharpness' slider)

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.

Given that the term "sharpness" (like "brightness" and "image quality") is solely a descriptor of human perceptual impressions - and not an objectively defined property, anyway - it seems that it would be hard to "break well established physical laws" when human perception itself has not been reduced to neat little atomized mathematical factoids.

However, the composite system MTF response (which is objectively characterizable) can indeed be improved. DxO Optics Pro's so-called "Lens Softness" optical corrections do so every day:

http://www.dxo.com/intl/photography/tutorials/enhance-sharpness-your-camera-dxo-optics-pro

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

It seems to work rather well with my copies. Sorry if you may find that a bit disappointing ...

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