I don't think your geometric diagram has much bearing on the actual
optical path through the lens or the apparent angles to the film plane
from any given element, especially with severely retrofocus lenses such
as the 21mm.
Chuck Norcutt
Allan Mee wrote:
> If a vertical line were the proper path, you can see that a scratch on the
> front of the lens would mean a larger displacement from the proper path by
> the time it reached the rear of the lens. But from the rear of the lens to
> the 'film plane' may be small enough that the light path hasn't deviated by
> much.
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