Quote:
Originally Posted by MikeyB
Thanks for that interesting observation report, Ben and congratulations on your new scope. You've got two great eyepieces there too and when you can get to some darker skies, I'm sure you'll be thrilled with what you see.
On the somewhat jerky focusing you mention, can I suggest you try turning the focus knob all the way from one extreme to the other a couple of times (many, many turns!). That should ensure that the initial manufacturing grease is more evenly distributed along the internal moving parts than perhaps it is at present.
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Thanks for this tip... I did it a few times today but now understand that the phenomenon - image shift or mirror shift/flop - is a common issue with SCTs.
The manual makes a very small mention about it in terms of saying that final focussing should be anticlockwise which moves the mirror against gravity. So overshoot clockwise and then move anticlockwise to sharpen up.