IPIX hemispheres, a set on Flickr.
Strange enough, back in 1998, Wired Magazine was given a suitcase from IPIX that had the Nikon, the lens and a gang of other materials including the software + keys needed to stitch a pair of hemispheres together to create the IPIX experience. Upon returning the case, i waited maybe a week before i went out and purchased a similar Nikon and the lens soon after that. While i continued to shoot some subjects as hemisphere pairs, i never took them the extra mile and converting them to IPIX. I recall that it was not a cheap process.