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.
jshergill426
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.
https://en.wikipedia.org/wiki/Circle_of_confusion
Yanda-Li
I don't really understand the part of zs, where does that equation come from?
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. https://en.wikipedia.org/wiki/Circle_of_confusion
I don't really understand the part of zs, where does that equation come from?