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Lens Resolution?


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#1 Scott Lynch

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Posted 10 October 2006 - 12:17 AM

I've heard a lot of talk recently about lenes having different "resolutions". For example, say a lens for a 2/3 chip SD camera would not be suitible for a 2/3 chip HD camera.
I'm wondering what is meant by "resolution". Is it a subjective term for the quality of the glass? Or can actual lens resolution be defined, such by calculating the imperfections in the optical elements or such...

Thanks!

-Scott
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#2 Max Jacoby

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Posted 10 October 2006 - 03:47 AM

The optical performance of a lens can be messured objectively. The two most common criteria are resolution and contrast. Most manufacturers publish the MTF (Modulation Transfer Function) of their lenses, which reflects the spatial resolution performance, i.e. the ability of the lens to resolve detail, which is a result of both the contrast and sharpness of the kens in question.

For a good explanation on how to read an MTF chart, go to this website:

http://www.luminous-...nding-mtf.shtml

It is important though to note that there is more to a lens than just its MTF performance. The 'look' it creates is just as important and that cannot be objectively meassured.
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#3 Scott Lynch

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Posted 11 October 2006 - 07:51 PM

Thanks Max,
That page answers my question :).

-Scott
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