Gee, thanks Alex, Chris, im flattered on references to HST
.
Guiding wasnt so tight (= far too much time in PS).
Actually, apart from star bloom, the 5min 3nm Ha subs were fine by themselves for both the core and neb, a supprise on hearing all the grief about the need for multiple exposure times for M42. Goes to show the value of 16bit Astrocams and narrow Ha
.