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[APML] Benefits of Registar?



Newbie question: Can anyone explain to me what are the benefits of stacking images with Registar (besides grain reduction)?
 
I downloaded the trial version and used it to combine two good film images of M42. The reduction in grain was obvious, but otherwise I didn't see any big improvements.
 
Will stacking images with Registar bring out more contrast or fainter details? I have a decent film image of M51 (it's no Tony Hallas or Rob Gendler), but I would like to improve the image contrast (darken the sky background) without losing the fainter details, as well as just bringing out more of the faint stuff. Here it is if anyone wants to look at it: http://home.twcny.rr.com/kevinwigell/images/M51b.jpg (I told you it was no Tony or Rob). This is 90 minutes on RG200, unhypered, 10" LX200 f/10. Can I expect to get more of the faint stuff if I stack it with more similar images?
 
Kevin Wigell