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Originally Posted by ving
whats the diference between registar and registax?
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I don't know everything about this topic.. but from my experience..
RegiStax is well suited to planetary work where you are concentrating on one small object in the FOV. It works around you selecting an object to align on, it then compares that area of the image to align, stack, calculate differences, etc. In theory the "Rotate" feature of Registax allows you to select multiple alignment points, I've not had success with this on wide field images.
RegiStar is well suited to wide field work where you are wanting to align the entire frame. You don't select an alignment feature, it identifies what it considers to be stars in the image and then aligns them all.
RegiStax is very memory intensive and slow at processing large (8 megapizel) images. RegiStar does them without working up a sweat and uses very little memory (usually around 100mb when I'm stacking 10 x DSLR shots).
RegiStax is very well suited to video's and 1000's of frames, more so than RegiStar where it's more suited to a smaller number (10's or 100's) of individual images.
RegiStar is extremely tollorant of differences between images - I have aligned and stacked images with it that other app's (RegiStax, CCDSoft) can't align.
RegiStar will align images when they are different in almost all regards: scale, distoritions (lensing etc), rotation, position, etc etc.
That's about how I'd sum it up.
Roger.