I don't usually shoot globs, but I have a new camera and clear skies and a choice between using a flattener, or guiding. Curvature without the flattener is about 44%, which is nasty, so I decided shoot some 5s unguided subs.
Only about 30mins of data, though I was imaging for 2.5hrs on this -- partly because the huge amount of overhead with short subs, partly because I discarded a fair amount.
This is uncalibrated -- no darks, flats or bias.
Larger version is available on
astrobin.