There’s a super rare Nikkor 6mm f/2.8 fisheye lens for sale on eBay. How much does f/2.8, 6mm, and a 220° field of view cost? A mere $34,020.
Aside from this uber-rare lens being uber-expensive, it’s also ridiculously heavy, weighing in at close to 11.5 pounds. Here’s what Photography in Malaysia has to say about this lens:
You are looking at one of the most gorgeous looking lens in 35mm SLR photography – a lens that can actually see behind itself! This series of lenses were originally developed for special scientific and industrial use where wider-than-180° picture coverage is required in surveillance work, photographing the interiors of pipes, boilers, conduits, cylinder bores and other constricted areas. But in applications such as advertising and commercial photography they are used extensively for dramatic effects.
To put the field of view in perspective, human vision is about 180°.