Since it’s almost Full Moon I decided to capture a star cluster to continue testing my new mount. This time with 90 seconds exposure time, like on the Star Adventurer.

A slight DEC error was present on 4 of 48 subs… The interesting fact is that the error appears in a 10 minute interval = one worm gear period of the iOptron GEM28!

Full resolution and more details

I counted 4 subs with DEC error. This is one of the four at 100% (cropped):

All other subs looked like that:

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