Diffraction Limit

Started Aug 28, 2013 | Discussions thread
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Detail Man
Detail Man Forum Pro • Posts: 16,400
Re: Diffraction Limit

Great Bustard wrote:

Too many relate the effects of diffraction to the size of the pixel as opposed to the proportion of the photo the Airy Disk spans.

The proportion of the an entire image-frame dimension is indeed important. However, the results amounts only to a simple scaling of the horizontal X-axis of the spatial frequency (MTF) function.

On the other hand, if/when the upper spatial frequency magnitudes of the lens-system MTF (itself) begin to attenuate the upper spatial frequency magnitudes of the composite MTF of lens/filtering/photosite system, we are talking about differences in the fundamental shape of that composite MTF response - something that is distinctly different from simple x-axis scalings due to Sensor Size.

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