Hi Chris,
What I was thinking regarding lens distortion was applying a lens correction profile to each RAW image (using say Photoshop) and saving each result as a loss less tiff, then stacking those, then stitching into a panorama.
Alternatively you could stack first, and then apply a manual lens correction to the stacked tiff images, then stitch those into a panorama. This may be less effective because (in Photoshop) manual correction is not tailored to any particular lens.
Its a bit of mucking about but can help to produce panels that are more regular and much easier to stitch into panoramas using automated stitching tools like Microsoft ICE.
Cheers.
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