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Parameters

fi1: effective focal length of the first lens
fi2: effective focal length of the second lens
e: distance between the two lenses
fi: effective focal length of the system
l: distance from the first lens to the primary principal plane</span>
li: adistance from the second lens to the secondary principal plane</span>
L: foot print of the system (maximum of the distance between lenses and the distance between the back focal plane and the farest lens