Quote:
Originally Posted by el_draco
Unique image of such a gorgeous cluster. Never seen it like this before. Magic!
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Quote:
Originally Posted by Atmos
Very nice Jewel Box and the Technicolour Raincoat is quite intriguing!
I have considering using my Atlas as a way of calculating how far my lower left corner is out but just haven't done it! Glad to know that it is an effective way of doing it.
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Glad you like it...as for the squaring on calculation, yes it's fairly straight forward. The only tricky bit is getting the direction right!
P.S.
It was yours truly who...some 25 years ago.... discovered how to measure mount tracking errors with the then "new" SBIG ST4 autoguider.
(does anyone still remember using illuminated reticles? )
It occured to me if I record a track-log with no guiding corrections, the results would map the Periodic error.
I mentioned it to Alan Holmes at SBIG.
It never occurred to SBIG someone would turn the autoguiding of their venerable autoguider OFF!
The STV then followed with PEC measurement as a "feature"
If you can't beat the extraneous light / lens flare / diffraction, embrace the serendipity!! 
