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Old 16-02-2012, 09:06 PM
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Moon (James)
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Moon is offline
Join Date: Oct 2008
Location: Melbourne
Posts: 1,147

Probably collimation and slightly off focus. Maybe the mount got bumped a bit too?

Which way was the camera mounted? across the scope or along?

For collimation, it pays to go back to basics and double check everything from scratch - eg center spot, secondary under the focuser etc etc. there are plenty of guides around.

I have 2 of these (200mm and 300mm) and one thing that has been bugging me lately is the secondary adjustment screws are only useful to position the secondary under the focuser. You still need to rotate the mirror by hand for collimation. If you use them for gross collimation, it actually swings the entire assembly out of position, so it's no longer correctly located under the focuser.

Also as Robin said, check nothing is moving around.

good luck.

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