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Yep to Marcs comments - my method is to take RGB and if the image looks ok I will spend the time on ha nd Lum. To evaluate quality I usually synthesise a lum by converting the RGB to a Grayscale and process that as a prelim lum.
On keepers (In Darryl Kerrigans words - ones destined for the poolromm) I usually spend a lot of time gathering Ha as well as Lum but combine them into a final Lum - if you blend correctly you can end up with all the faint Ha data from that filter as well as covering the tonal map with the lum filter - still requires more processing than straight lum but yields a far better result IMO.
So yep - it's bandwidth but use of both of them both can be advatageous. eg the red filaments in the Crab or the streamer curtain above the horsehead can be captured by the narrowband Ha but it wont be as obvious in the lum - but as Marc points out you need the lum data to avoid the salmon nebula - I remember when salmon was a food type not a colour.
Makr bolton
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