Hi,

   I have a non-rotationally symmetric system and in my application I want to convert “Real Image Height” to “Object Angle” and reverse. The conversion works fine for axially symmetric systems (like Cooke triplet) but it is not working correctly for a non-rotationally symmetric system. By that I mean, when I convert “Real Image Height” to “Object Angle” and then I do reverse, (from “Object Angle” to “Real Image Height”) I do not get the same “Real Image Height” values. I am wondering if there is any issue with “Convert to” or I should use an intermediate step to get the correct conversion. 

Thanks,

Soroush