thanks all for the high praise. i appreciate the kind words.
Dave - it was my trusty old Vixen GP-DX setup on the beach for the week. any eq. mount could have done the job.
airglow certainly seems stronger looking south than other directions and the comet has just been an excuse for a whole lot of people than usual to push some wide sky shots hard? having said that i haven't seen so much green airglow in my other sequences before?
the processing of each sequence has the same colour balance.. so as far as i can tell the colour variation is real although the contrast stretching exaggerates it. no extra saturation though..
cheers
Phil