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/snip/... ray tracing. Is it too much of a leap from the previous to have a good idea what happens? /snip/
p.s. I covered the top half of a projection lens (Kodak diapositive projector) and the field did not darken uniformly, but one would expect uniformity only in the position where one places a stop. The final lens was set back in the barrel, also. I tried another lens w/ the last lens at the mouth of the barrel; rather good uniformity. Finally covering half the lens (two stops; 1/4 transmission) produced much darkening! One quarter was much less, but noticeable.
On 2010, May 19, , at 15:14, Anthony Lapinski wrote:
/snip/ "If you cover the top
half of a lens, how will the image change?" He struggled with this and
said that his teacher never discussed this in class. To me, it's a
fundamental idea of optics.*