[Raytrace] rotation, special aperture ,ellipse, BUG, with OSLOLT ? (fwd)

[Bob May]

The purpose of programs like OsloLT is to design real world optics.  Towards
this end, sources and so forth can be described as what they are.  Are you
using a point souce with a particular angle of expansion with this?  A
ellipse should focus from one focus to the other focus position, irrevelant
if there is another mirror in there.  If you have all of the examples, I do
believe that there is a gregorian telescope design in there.  That is a
parabolic primary and a concave elliptical secondary.  FWIW, the design
which takes a parallel beam of light and turns it into another smaller
diameter beam is the Mersenne design and that uses two confocal paraboloids.
Bob May
http://nav.to/bobmay
bobmay@nethere.com
NEW! http://bobmay.astronomy.net