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That's a very simple question;perhaps if it were a more complex question the many excellent photographers on MacRumors would be better able to determine what would be the best for your needs.
 
ArcSoft's Panorama Maker came with my Nikon camera and I have had no trouble with it. Oonly used it a couple of times but it is easy to use with clean results.

::20ROGERSC::
 
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