[gregbradley]

With panoramas (I do them a lot) you often need to add in some manual stitching points (usually called control points in PTGui Pro). So not stitching is usual. Shoot in portrait mode and try to get some landscape in each shot. Sky only usually fails in stitching and you have to manually click on the same star in adjoining images.

You can also take it further and get a panorama head like Nodal Ninja 4. Then the images are corrected for parallax error if you set it up properly.

When shooting at 14mm though, parallax errors are pretty minor.

ISO6400 is pushing your 7D way hard. You are losing a lot of dynamic range and the resulting image is overstretched. Ideal would be closer to ISO1200/F4 and 2.5 minutes on a Polarie. But then its hard to move the camera to the right angles needed for a panorama. When does it ever end?

Greg.