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Peter CCDinspector is a good tool but you must meet certain criteria to get the most out of it. If you chuck in a coloured jpeg with poor guiding the results are going to vary wildly. I have found it best to only analyse untouched subs (fits generally) when my guiding and focus has been very good and thus have achieved consistent results. I have also used it to collimate my LX200R and the results were outstanding as was plainly evident when viewing Jupiter. Yes the program can give rubbish results but usually after you stick an image in which has had lots of processing and exihibits poor guiding. As for CCDstack, its worth it's weight in gold especially if you get Adam Block's tutorials.
Mark
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