Some needed shapes

[johannct]

I would like to use pyoptools but for my problem (modeling a Newton telescope), I am a bit lost... I need the following :

• a parabolic mirror (it looks like this is feasible with the current code, but expert example would be appreciated)
• a flat elliptic mirror. This does not seem supported.... If correct, is it possible to add it?
• a circular aperture with a central circular stop and the 4 arm stop of the central circular region. I guess I can find a way to use the current code for that, so it is a minor question.

[irfanimaduddin]

I also have same problems. I want to model a Cassegrain telescope with pyoptools but I couldn't find how to make a circular aperture at the central of a mirror. Could someone help? Thank you in advance.