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I made the biconvex lens with the following parameters: focal length=30 mm R1=30.4 mm R2=-30.4 mm lens diameter=19.1 mm center thickness=3.1 mm environment IOR=1 lens IOR=1.515

I set up a 2f optical system But the result is not correct, the focal length differs from the theoretical value by 1.5 times:

I set up a 2f optical system:

But the result is not correct, the focal length differs from the theoretical value by 1.5 times:

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    $\begingroup$ Hello :). We're Blender enthusiasts here, not optical engineers. What exactly is your question? What have you tried to solve the problem? You can also add the material setup and the file pasteall.org/blend $\endgroup$ Commented Jul 20, 2021 at 10:41
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    $\begingroup$ The camera already has a lens on it. Have you accounted for this? $\endgroup$
    – TheLabCat
    Commented Jul 20, 2021 at 11:33

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