Additional Remarks on 30 Aug:
It should be M22.
I simply do it this way, use the widest lens (8.5mm), 0.5-1s at nearly maximum gain to scan around until I saw any non-stellar faint fuzzy, then I center it and then attach the 75mm lens, lengthen the exposure to a point so that the stars will remain pinpoint, adjust the gain to get good balance of exposure and noise, start recording an AVI, and then registax with de-rotation (dead slow), done.
Further processed and cropped version:
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