Diffraction Limit

Started 11 months ago | Discussions thread
Steen Bay
Veteran MemberPosts: 6,188
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Re: Diffraction Limit
In reply to Anders W, 11 months ago

Anders W wrote:

LTZ470 wrote:

From a very credible source:

"Diffraction thus sets a fundamental resolution limit that is independent of the number of megapixels, or the size of the film format. It depends only on the f-number of your lens, and on the wavelength of light being imaged. "

You think this is a very credible source?

http://www.cambridgeincolour.com/tutorials/diffraction-photography.htm

Have a look here:

http://www.dpreview.com/forums/post/51853899

It's correct so far though that it's the f-stop that determines the size of the 'blur circle' and therefore the theoretical max resolution measured in lp/mm on the sensor with a perfect lens on a sensor with an unlimited MP count. In that sense the diffraction is independent of the sensor size, but it also follows naturally that a larger sensor will have a higher potential resolution at e.g. f/4 than a smaller sensor, simply because it's larger (lp/mm x sensor height in mm = lp/ph).

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