Joe Gwinn wrote:
.........
The bounding case is to draw a cross-section of the lens and imager, with the
cross-section cut on a diagonal of the sensitive surface (image frame), so we
can see right out to the corners of the frame. The cross-section plane must
include the optical axis of the lens. Draw two lines, from the extremes of the
back lens to one of the frame corners.
This doesn't work with retrofocus wide angle designs, which are the
majority of the problem. With the back focal node behind the back
element, this method will understate the angle of incidence problem.
Moose
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