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Hi Brent,
You absolutely have to get a Astronomik CLS filter. I have the EOS clip in and shoot from my pretty polluted backyard in Pakuranga Heights. I took the same image with a ED 80 at f/7.5 on a 450D each frame 360sec at ISO 800 - no worries at all. The emission nebula with the horse head is clearly visible in each sub, almost no need to photoshop.
Cheers
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