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
2

Anti-reflection coatings behave differently according to the incident angle. Wider apertures typically have  incident angles that are further from the normal.

Also, wider apertures typically have light passing through the thinner parts of the elements, and so have less absorption, but I don’t think this is dominant. 
Regards,

Alan

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