Quote:
Originally Posted by SimmoW
A really violent image that Andy, in a good way! Congrats on a pretty difficult process from what I can see.
I loaded up the Astrobin version, and can see a weird patchwork/grid pattern all over the image, like a flywire screen. What's that? Or does my monitor need turfing?!
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Thanks Simmo - the grid showed up in an earlier version too - can only think it may be in one of the flats or a preprocessing misalignment thing perhaps. Honestly not sure.
Quote:
Originally Posted by ghsmith45
I would have thought that if it was the flattener, all the corners would be equally affected. If it is focuser tilt then you could try carefully focusing a star on one side of the field (using a bahtinov mask for example), then focusing a star on the opposite side. If these are different (and it won't be easy to get it accurate) then the way you have to move the focuser will tell you which way things are tilted. Then follows trial and error shimming. It may also be slack in the focuser, so tightening it up may work.
Another thing to try is to put a laser collimator in the drawtube and see if the spot hits the centre of the object glass.
Good luck!
Geoff
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Aha, ok, thanks for the tip Geoff, I'll give it a go as soon as these clouds nick off! So much still to learn...
Cheers
Andy