Can someone explain lens cast by aperture to me

Started 3 months ago | Discussions thread
Alan WF
Alan WF Senior Member • Posts: 2,881
Re: Can someone explain lens cast by aperture to me

Conversely, if the lenses suffers wavelength-dependent vignetting at the iris, I’d expect the color shift to be independent of the spatial scale of the feature.

Any idea which is it?

I think it is most often wavelength-dependent vignetting, as you called it -- and nearly always the blue is much weaker wide open and reaches normal levels when stopped down. The interesting thing is that it is very common, but usually not very obvious.

If that’s the case, then the image of the entrance or exit pupils when close to wide open should show clear lateral chromatic aberration, even to the eye. Is that the case?

Regards,

Alan

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