Hi Greg,
If you buy the CCDIS plugin for CCDStack, you get the same functionality in CCDStack. The Registar program is good at registering pictures, but CCDStack allows you to do so much more, and there's one less program to push all your data through.
Also if you already own CCDInspector, that installs the CCDIS plugin into CCDStack.
US$290 for CCDStack and CCDIS, $380 for CCDStack and CCDInspector, $90 for the CCDIS plugin alone.
US$149 for Registar.
Horses for courses, but if you already own CCDStack or CCDInspector, buying the other gets you so much more than a star registration algorithm.
Cheers
Stuart
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