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Thanks for the replies guy's.
It seems yet another reason I should have chosen a different camera to the ST8 when upgrading from my ST7. The preflash sounds attractive.
I typically cool with the cooler power at 80-95%. I will do some testing to see what results are like if I drop it back to 60% or so.
I rarely photograph bright stars, I'm finding most of the ghosting is coming from stars fainter than magnitude 6 in these exposures of 60 seconds. It's surprised me just how faint a star can cause ghosting which lasts for at least one additional exposur.
I'm seeing the problem a lot in my supernova imaging. Time between the start of each exposure of a different object is approx 78 seconds (including slew etc - 60 sec exposures, 18 seconds slew and other delays).
I can pretty much guarantee every photograph has ghost stars, and considering I'm working at a narrow field of view on mag 10-15 galaxies you can imagine most fields don't have particularly bright stars. It's a shame the problem is so persistent even under these conditions.
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