Fisheye lenses are quite specialized optics and not to everyone’s taste. Their strong curvilinear distortion has a certain creative appeal and may offer some technical applications such as measuring cloud cover or astrophotography, but they’re probably not a lens type you would use every day – especially a fisheye zoom.
The other example that comes to mind is the Nikon 8-15mm fisheye zoom for F-mount DSLRs, but that swaps from a circular view to a full frame capture at opposite ends of the zoom range.
