Diffraction Limit Discussion Continuation

Started Feb 21, 2014 | Discussions thread
Ulric Veteran Member • Posts: 4,534
Re: Duck, duck, goose.

Jonny Boyd wrote:

Ulric wrote:So your single-sentence definition is something like "Resolving power decreases visibly when the lens is stopped down one stop"?


'The diffraction limit for a system occurs at the aperture at which any further reduction in settable aperture size will cause a visible decrease in image resolution.'

'for a system' clarifies that the sensor resolution and viewing method are factors.

'settable aperture size' allows for the fact that different lenses have different limitations on how precisely the aperture is controlled.

So in your opinion, a system where the lens has half-stop aperture settings has a different diffraction limit than an otherwise identical one where the lens has full-stop settings? Many lenses (especially for video) have no stops, then what?

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