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Hi Ken - what I got last night were 'squiggles' for stars. Not focus or they would have been blobs. Not tracking because I did two sets of spectrum subs with lots of other ordinary images before, between & after and tracking was good. The squiggles were exactly the same size and shape in every spectrum frame regardless of exposure time, albeit a bit brighter in the longer set of subs.
Disconcerting really, I've had odd shapes generated before but nothing like this in elongation (the last thing you need!). Hope the grating's not breaking down and that it's some issue like a particular condensation on it or something...
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