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Definitely a dramatic difference with your QHY9 Colin. Are these single subs or stacked images with equal amount of integration time? If these are single subs, then obviously the longer subs with have better SNR.
I agree with Glen. With my gear (f/5.6, ICX814, imperfect mount and heavy light pollution-I live very close to the CBD) there is very little difference between images integrated from 5-minute and 15-minute Ha subs, even in the dark areas.
If I had a better mount, I would certainly go for fewer but longer subs, even if only to simplify stacking, but given that my mount does not deliver consistently good guiding, I may try living with shorter subs.
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