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I use both the DMK21 and DMK41 firewire cameras for solar Ha imaging.
I use a double stacked SM60 (on an ED80) and a 88mm modded PST.
I find I always need different exposures for the surface and the proms.
The surface is usually around 1/120s and the proms as slow as 1/11s.
You obviously combine the images.
HTH
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