The list of all professional quality panoramic tripod heads.
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Small iPhone fisheyes adapters are an inexpensive solution (~$20) to make your first spherical panoramas, not to mention you can easily carry your pano gear with you, at all time.
Fisheye lenses compared: Sigma 8mm f/4 and Nikkor 10.5mm f/2.8, currently the most popular short focal lenght fisheye lenses used by panorama photographers.
When shooting in a dimly lit location or for a night panorama, the extra hand held shot is not an option. The technique is illustrated using a Nodal Ninja panoramic head.