Thanks every for the comments!
. I am quiet happy with the results from the sigma zoom lense! there is some flaring in the top corners which does`t seem to go away without stopping it down quiet alot! but for $450 its good value.
Wasn`t the best weather that night but with a bright iridium flare coming through I wanted to have a go. We don`t seem to get many in the evening, mostly before dawn!! Also very warm that night as only had my T-shirt/shorts on which was really unusual! Made the frames very noisey and more work to process. But I got the sucker..
Thanks everyone for your comments...
Cs Gary