Hi,
I've been trying to figure out how you do a star test or collimate with a star as its supposedly the most accurate method. but how on earth do you see those airy discs/rings.
I'm primarily using a camera and not an eyepiece and have tried short exposures, defocused, and defocused slightly as well. as I defocus, the star gets bigger and I can see the shadow of the secondary in the middle and the spider, but that's about it. no disc.
anyone had any luck with this method?
http://legault.perso.sfr.fr/collim.html
Cheers
Alistair