I'd hate to say it, but imaging at F/8 through a Ha filter, you really may want to consider 20 minute subs... The area below the curtain is still pretty dim in your shot, and there is lots of detail to be had down there...
On a brighter note, the detail you've captured in the horse head and in the curtain, including the streamers, looks very - very nice! Looks like you've got that guiding and collimation under control! Was this guided with the OAG or with the ED 80?
Good going mate.. More exposure required, but a fantastic start!
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