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The new Edge HD SCT's and ACF's are very good for imaging. Virtually no coma and nice flat field, but do suffer from dew issues.
SCT's generally are great for planetary imaging. Noted greats are the C14 and C9.25.
Maks do tend to give very pin sharp stars on the other hand and some of the more expensive ones are quite nice for imaging. I think Eddie Trimarchi (spelling?) is using a Mak but of the more expensive variety.
Large Maks are untested for planetary imaging in general but I would say they could be quite good. Cost factor is certainly an issue with large Maks.
Visually both scopes are dim but the SCT's are the way to go.
If I was going down this path I would suggest either of the new SCT's over the more costly Maks.
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