you could scale the 50D data down and add it to 450D data... I've seen a guy from Europe, who took one set of subs through his C8 SCT and a one set through a ED80 and layered the close up detailed shot of Orion on top of the wide field image.. Was a nice effect... super detailed wide field shot...
Edit : At the price of a 50D and modding the 450D you could get a dedicated cooled CCD... Not wanting to sound like a broken record or anything... but there you have it.
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