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Old 23-12-2011, 11:57 AM
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multiweb (Marc)
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Join Date: Oct 2007
Location: Sydney
Posts: 22,060
Quote:
Originally Posted by mldee View Post
OK Marc, Thanks for that advice, I promise I'll leave you in peace now.
No at all mate - keep firing away.

Quote:
Originally Posted by Troy View Post
Hi Marc,
Thanks for the board idea. The markers you have on the ota, do they line up with the four screws at the back of the primary mirror(the ones with the nuts on them)?
Once you start normal collimation I would be interested to hear how much the ota moves on the rollers, when you start adjusting the collimation screws.
I marked the primary directly. It has a small bevelled edge. I aligned the first mark with the black line at the back of the primary. Then I wrapped a paper tape to mark the other three. Don't rely on any screws or mechanical features on your scope tube. The holes are not evenly spaced.

I stick a carton business card on the roller. They're rubber castor wheels and that's enough grip to stop the OTA from turning. I remove the dovetail so it doesn't weigh the scope out of balance too.
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