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It's very true the NB filters on a mono CCD may well give you the best signal through the skyglow Richard, but if you haven't learned the ropes with aligning, tracking and guiding you still won't get a good final result. You really don't want to be taking pics above 1m focal length if you can help it (and F10 focal ratio makes collecting good data a time consuming affair). A reducer on an SCT might get you down into a more manageable guiding ballpark and also drop the F ratio. Flexure or off-axis guider issues can be more "exciting" the longer your FL.
I'm not an SCT guy however - others here with plenty of experience may comment.
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