Hi and G'day to youse all,
My first post only joined ISS yesterday and the telescope owning fraternity a few months ago. I'm a complete amateur and worried about taking a screwdriver and allenkey to the 6'' and 10'' GSO dobs. I found Andyshotglass's collimation video really helpful but the first images on the video didn't match what I could see through the Cheshire eyepiece. I bought a laser collimator - still no corellation, though it proved I was facing a situation of major uglage only with the 10''. The visual correlation key came from
http://skytonight.com/howto/diy. The article on collimation was brilliant and the cardboard did the trick. Now I see what Andy saw through the peephole. Where's the screwdriver!
Steve