Autoguiding will certainly help your imaging Alex. M16 needs at least 6-10 minute subs depending on your skyglow conditions etc. I did some 15 minute exposures the other week but the light from nearby city / car yards etc really started to effect things badly so while I am still living here I will probably have to stick to 6-7 minutes subs just to keep things under control.
Looks like you will have a good image scale or is this a crop ?
