Panoramic stitchers

On the panoramic stitching software I have there's a field to enter the focal length of the lens.  I assume that since I'm using an APS sized sensor I should multiply the true focal length times 1.6 to get that number, correct?  If it do that it seems like it would be off since the distortion won't be correct for that focal length lens.  Any thoughts?
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if you let the software try to "fix" the distortion you'll probably not like the image. better to have a really odd shaped photo and crop it to the size you want.
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