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Coma or spherical aberation? I would say the latter due to large Camera chip size and fast optics.
The teardops are all over the field but are most obvious on the brighter stars. This looks to me like you have some movement in the mirror (or secondary) or in the DEC axis. Typically this happens when you 'goto' a target and then start imaging it. On occasion the backlash in the dec 'flops' out and your image moves.
One other posibility is if you are guiding in Dec and have some PE issues there.
Cheers
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