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Thanke everyone. Yes I will see if I can come up with some note re: Iris, yes it has a steep learning curve but does have some powerful features.
One night I will put on the Ha filter and take a single 1 hour exposure and process it with a 1 hour dark and see what the result is to compare with shorter ones totalling 1 hour.
I find shooting at ISO 200 gives unwanted banding, so whatever setting I use I think I will always keep to at least ISO 400.
Ive advised Paul re the next DSO challenge, hes assured me he will soon come up with soemthing.
Scott
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