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Ok if you have images that are difficult to line up and stack then the best program around that I am aware of is Registar. Not registax. I'm not sure how much Registar is though. The easiest way is to get your camera piggybacked onto a scope on your EQ mount.
As for how long you can image for with a 200 mm lense. At the declination of Eta Carina, I'd say between 4 - 5 sec. Any longer and you will start to get trailing. The formula is
t (sec) =1000/FL near the celestial pole and
t (sec) =700/FL near the celestial equator.
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