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  I have changed something in the settings were it is not allowing the camera to take continuis pictures. When using my trigger the camera is having to wait about an aditonal 20 seconds before it will take another shot. What have I done wrong? It use...

What is the best software to buy to stack pictures for star trails? Canon Rebel T1i.

I have a rebel T1i. What would be the best software to buy for photo stacking? I would use it for star trails.