Was laser collimating my 4" desktop dob today (the collimator came in the mail) and ran into trouble when I realised after I adjusted the secondary mirror, it was pointing in the centre but the mirror's centre is not reflective...
Bugger!
Took me ages to work out what I was doing wrong... I'd seen all the youtube videos and thought it'd be easy but no matter how I adjusted the primary, I couldn't get a nice red dot onto the collimator target...
I ended up getting there but had to work off the feint laser reflection... Anyhow, it's better than it was before I started...
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