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Jan 29, 2015 at 10:05 comment added Matt Grum The entrance pupil is where the aperture stop appears to be in a lens, the location coincides with the optical "centre" of the lens, the vertex of the camera's field of view. This point is referred to as the "centre of projection" or "centre of perspective" in certain fields (such as computer graphics), and more commonly the "no parallax point" in photography.
Jan 29, 2015 at 9:50 comment added p2or Thanks @MattGrum! Interesting - what is an entrance pupil? Never heard of it. Can you please explain it a bit more? New question? :)
Jan 29, 2015 at 8:27 comment added Matt Grum For the first two applications mentioned (match moving, panoramas) it's the distance to the entrance pupil of the lens that is critical, not the distance to the sensor.
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