[Carl]

6th night now i've been clouded out whilst trying to collimate my RC8; not a happy boy.
So here's the question. I understand how you would use an artificial star to collimate secondary mirror, but how would you do an artificial star test to collimate the primary on a RC8?
Do you place the star at different corners and check for correct concentrict circles when out of focus or can you still use the bahtinov mask technique

I just want to get my collimation done so i can get back to imaging once i get a clear night.

Regards
Carl