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hi paul i too have the 60da and it is the first camera of any sort i have ever had
i have noticed in some of my "warmer" pics they pick up striations running through the whole frame
rod is correct i shoot everything at iso800 because through trial and error this seems to be the best
i shoot prime focus through a c11 at f6.3 and my maximum exposure length is 3 mins with a 2" LP filter attached 5km from perth cbd
some people in severe LP cities still do not use an LP filter as they say it strips colour
there is a man that lives only a few k's from me here who does not use a filter and he has some of the best (especially wide field) pics i have seen so there must be some validity to this argument
good luck
pat
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