Okay, I have been playing around with Nikon's 10.5 mm fish-eye on the D70
for a few days now. My intention is to eventually use this lens to take
instructional photos inside the airplane, but meanwhile I have been
experimenting with interior shots and some scenics.

The worst problem I have had is learning to keep my own fingers out of the
picture.

The lens seems to work very well as an extreme wide angle or even a
panoramic. There is some noticeable vignetting at the smallest aperture, but
it is not terrible. It is probably easiest to remove the vignetting first
before doing any other post-processing.

Of course, being a fish-eye, there is a lot of barrel distortion. This is a
rectangular fish-eye, so it fills the whole sensor instead of making a round
spot, but the distortion is very evident nonetheless. Also, the lens greatly
exaggerates vertical perspective tilting.

Nikon Capture removes this distortion in one step. You can choose to either
keep a very wide angle view with some cropping or you can keep the whole
picture, but with an hourglass shape. In the latter case some items that are
not recognizable or are just lines on the edge of the picture suddenly take
on recognizable shape, as if the unadjusted photo contained more information
than is visible. This is important, because things that you thought were not
in the picture might suddenly become a noticeable distraction.

ImageAlign is available both standalone and as a PS plug-in. The interface
is identical either way. It allows you to correct out all the barrel
distortion -- or even go past a complete correction if you wish. Skew and
tilt sliders allow correction of all kinds of perspective errors. I find
that the order in which you use these controls makes a big difference in how
effective the other sliders are. You can leave the hourglass shape or zoom
into a crop to achieve an effect like Nikon Capture. Overall, ImageAlign is
far more versatile, but Nikon Capture's one click correction is very nice.
Capture also allows you to choose a background color to fill the hourglass
sections, which can be very handy if you plan to knock the image out of its
background.

It would be interesting to try to stitch a few fish-eye shots together to
make a huge panorama. It would take some doing and a lot of work, probably
with ImageAlign, but it might be possible.

A third adjustment tool is Pano Tools, which is free. I have not tried it,
but will probably get around to it one of these days.