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Lecture 16: Cameras and Lenses (84)

What's the difference between z_i and z_s? Looking at the diagram, I would have thought that z_i is the diagram focus because that's where the lines converge.


Z_I is the distance where the Blur Circle of Diameter C is in the focused object plane, while Z_S is the distance where the same Blur Circle is an unfocused virtual image.


I don't really understand the part of zs, where does that equation come from?

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