Heroique's current T vs B question prompts me to bring up something of my own that actually did keep me up last night thinking about:
I've heard it explained here that surprisingly large scratches on the front element of a lens have no effect on image quality because rays of light from all points in the scene enter through all parts of the front element before being focused onto specific points on the film. Fine, I guess, except if that's the case, then why does tilt work? Wouldn't rays of light from near points of the scene, entering the part of the lens tilted to focus far points, then be sent to the film as an unfocused near point? That's one hell of a tangled sentence, but I hope it makes sense.
So why does tilt work?
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