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Message: <blockquote data-quote="dslater" data-source="post: 363470" data-attributes="member: 32537"><p>I don't think anyone is trying to make you justify the question. The problem is that we can't answer it for a real lens because not all the relevant data is available. The calculation of a theoretical ideal lens is relatively simple, but your lens, like almost every other lens out there is not perfect. Performing the calculation you want requires detailed knowledge of the optical characteristics and aberrations of your lens. This information is not published. Further, there's variation among individual copies of a given lens, so even if this information were published, it would be average values, not the specific values for your particular copy.</p></blockquote><p></p>