Diffraction Effects (Example Photos)

Started Nov 27, 2011 | Discussions thread
Kaj E Veteran Member • Posts: 9,359
Re: diffraction is a gradual thing so you need some margin of error in prediction.

AV Janus wrote:

But since it depends from the size of the hole the light passes through, wouldn't it be also dependent on focal length of the used lens?

Is f8.0 aperture on 24mm the same diameter as f.80 on 135mm lens?

The diameter of the airy disk is directly proportional to (light wave length) X (focal length):(aperture diameter). Focal length/aperture diameter is actually the f-stop number for the lens. The size of the airy disk is in this way only dependent on f-stop number and wave length of light.

The focal length is already included in the f-stop number.
Kind regards
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It's about time we started to take photography seriously and treat it as a hobby.- Elliott Erwitt

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