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Hi Adrian, the ED 127 is a good choice (I can say this because I just bought one myself).
The length of exposure is going to be a major limitation on the image you produce. Ten seconds on M42 in a single exposure will get you a pretty basic image. Have a look in this forum about 8 or so days back when I posted my ED127's first light. That was 3 x 10 minute exposures stacked and tweaked with Photoshop. That'll give you a sense at least of the scale that is possible in straight prime focus imaging on this scope.
I suggest that you consider guiding and, with that, the possibility of longer exposures. Then, I suggest you consider stacking multiple images and using an image processing program like Photoshop to tweak out the data that is lurking in the images.
Come down to Ten Chain Hill on one of our New Moon nights and have a play with some other imagers and see whether they can help you too.
Peter
Peter
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