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I have imaged with an achro and it can be done but never as good as a good ED refractor or a coma corected Newt. A Baader Semi-APO filter on the achro can stop some of the CA and a longer fiocal length helps. In terms of low cost entry to imaging it is hard to go past an imaging newt, where you can get a new f4 or f5 10" newt for less than a 80mm ED refractor. Remember shorter f# means shorted exposures for the same target, and as always aperture is king.
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