The upper two images above were taken with a Nikon D3 camera and a Nikon 16mm f2.8 Fisheye lens. The venue is the Marriott in Burr Ridge, IL. The top image is the original image and the middle image is one that was corrected in Adobe Photoshop CS5 Camera RAW. The bottom image is a standard 24mm image taken with the Nikon 24-70mm f2.8 lens. All images were taken in the RAW format.
While the corrected image "fixes" the curved distortion so typical of fisheye lenses, it does stretch the image on the far left and right sides. If you zoom in, you'll see the distortion. Still, it is possible to crop the far left and right sides to eliminate the distorted sections, but it makes the image less wide by doing that. The 24mm image doesn't have the curved distortion, as expected, but it has a much less wide angle of view..
Remember too that the Nikon D3 is a full frame camera. So the equivalent focal lengths using APS-C sensor digital cameras would be 10.5mm (compared to the 16mm full frame fisheye) and 17mm (for the 24mm full frame lens.)
I suppose you need to make decisions as to what's most important. Be sure to click on each image for a closer look.
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