This is the best app I have ever used for stitching photos together to make a panoramic image. If you have MAGIX Movie Edit Pro 15 Plus, then this is an upgrade feature for $29.99 USD. You can also get it direct from TSHSoft.com for about $42.
http://www.tshsoft.com/en/index.html
On my initial try, I had a photo that needed to overlap another photo by almost 80%, but PanoramaStudio didn't quite get it right. The reason is there are settings that limit how much to overlap. After I changed the settings to overlap by 90%, the photos stitched together perfectly. Stitching together six photos is a breeze. I can't tell where the seems are, the blending is too good.
If you aren't satisfied with the results, there are some very nice controls for getting things right.
This is another amazing app that I would have to put up there with Prodad Mercalli stabilizer.