I find stitching wide angle mosaics needs a program that can handle the lens distortion. For example Kolor's AutoPano Pro or Giga which you can tell the f-ratio and focal length so it can calculate distortion matricies.
The usual astro programs can fail totally at lengths like 18mm. For example, Nebulosity turns a series if frames into a mixture of stars and varying length trails depending on how far they are from the ones chosen to to the alignment.
With longer focal lengths - say beyond 200mm - the distortion is minimal and just about any stitching program will work.
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