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Hi Trevor,
I'm no expert, but is the 450D modded or standard?
Could be the issue with the nebulosity not showing on a standard camera that blocks most Ha perhaps?
Of course, if I am wrong, then so be it, someone will tell me I am sure. Seems you got the Witchhead Nebula near Rigel showing up, although it looks a little B&W like M42 looks, and obviously small at that widefield scale.
Just my noob 2 cents, hope it helps?
Cheers
Chris
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