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Thanks guys. You are probably right - not enough data.
Trevor - I'm using a Equinox 100ED + EQ6PRO mount. Since I don't have a permanent setup, nor an ability to have one (long story short my parents property is in about the worst possible shape/position/location possible), I'm having to setup every time. At this point I am not doing an accurate polar align, I'll try this via the drift align method when I get a Reticular eyepiece with about 90x mag. That should hopefully allow some longer subs then.
I'm shooting from suburbia Brissie - Ipswich. So, LP is an issue. The Mark IIn camera is older as well, so noise at ISO 1600 is quite bad, especially when compared to newer cameras like the 5D Mark II.
Bojan - I have a sneaking suspicion that the black artifacts are from DSS trying to remove hotspots from my camera's sensor. Again, I'm very unhappy with Canon in this respect - my Mark IIn has probably 100+ hot pixels even with Six second exposures. It's not normal and is not within spec I believe and is disgraceful QA from Canon.
I'm to the point where after being a Canon user for 20 odd years I'm going to give them the finger and switch to Nikon. Far better cameras imho.
Dave
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