I designed a zoom system of 10x [min mag = 1/sqrt(10) and max mag = sqrt(10)] with PNPP configuration in which lens group 2 & 3 are moving with fixed BFL. Ideally the Angular Magnification should be increasing in zoom system. But in my case initially it is increasing then decreases(rapidly) then again it starts increasing (like from 0.2 - 0.9 then comes to 0.5, again increases 0.5-0.8). And also lens movements are also like S for both moving lenses. How to figure out the movements and magnification?
Question
Magnification movements of zoom system.
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