Quote:
Originally Posted by codemonkey
Thanks Martin :-) I use (all catseye) a cheshire for primary collimation and the off-axis pupil of an auto-collimator for secondary. I'm pretty confident of primary collimation but suspicious of the secondary.
I've been thinking about replacing the cork pads with something else after I found the mirror stuck to them once which (I think) was causing astigmatism, but I've never gotten around to it. Might just replace the entire cell at some point.
I doubt it'll be tracking with 1-5sec exposure on a very well aligned, pier-mounted Mach 1 so I think I'll be able to cross that off the list pretty easily. I think I'll also see the elongation switch direction as I shift focus, so I'll test that up front.
|
Lee if your elongation shifts when you rack the focuser, i would say that is your problem.