Yeah that's the key with a fisheye - keep them level.
I wonder if that also works with the lens in portrait orientation. I'll have to test that, I think it does work that way as well.
I find defish plugins don't work very well getting rid of the excess curvature so the best approach it to try to keep them level. Not that easy when the MW is at the zenith after dark like it is at the moment.
Greg.
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