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Thanks guys, that's what I thought it would be..
Long time ago I took one frame of M42 (to see how the whole setup behaves), but it was when Newt was on AltAz mount (motorized of course) and I think I remember the coma was not a big issue then (maybe because of field rotation).
Anyway, this is only planning exercise... I may be tempted to use some sort of focal reducer to widen the field a bit, but then again, mosaic (with Registar) may be a better option regardless of more time needed.
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