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Hi Dennis,
Yes, my 12" suffers a bit from collimation drift. I notice the secondary tilt changes from setup for about 2 hours, very strange, I think it has something to do with the thin secondary vanes cooling down and contracting.
I often find I have to check every hour to be sure, and more often than not, have to retilt the secondary, Bob's knobs are on the wishlist as the allen key dance is very annoying.
May just be my one (white, not BD black) which I suspect is an inferior version to the black ones from accounts I have heard / read in magazine reviews.
Because of the fast F5 mirror, if its not spot on, then the views suffer a lot.
Glad you sorted it out.
Cheers
Chris
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