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Great shot there. The DSI really lends itself to taking good pics of objects like this, as they well suit thr chip size.
The IR filter will make more difference with red emission nebulae like the Horsehead, no filter will allow in more nebula light.
Heres a challenging one for you, Planetary neb He2-111, its deep red so remove the IR filter for it
Heres large and small scale finder sharts for it generated with Star Atlas Pro. The nebula is easy to photograph but VERY hard to see. It took Andrew Murrels "Hector" 20 inch Dob at Lostock to see it.
Scott
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