Who knows if fish really see the world the way a fisheye lens does. The good news for them if they do? They can see a lot of things coming for them. Fisheyes are known for extremely wide angles of view, and extreme distortion of space. Don't think this is a bad thing: when used in the right situation, fisheye lenses can lead you to new and unique perceptions of the nature of spaces around you. Try a lens like this Sigma Photo 4.5mm circular fisheye on a city street, or a long subway escalator, or taking a close-up of your dog. You will no doubt find new and different ways to document the world around you.

A circular fisheye gets most all of what's in front of you and puts it into a circular image surrounded by a black field. If you've ever seen a convex mirror, the effect is very similar.

This Sigma Photo 4.5mm  EX DC HSM circular fisheye features an f/2.8 aperture,  so it's a good choice for indoor spaces.

Product Highlights:

  • Canon EF-mount
  • light-gathering 4.5mm f/2.8 EX DC HSM circular fisheye lens with 35mm equivalent of 7.2mm on Canon cameras with APS-C sensors
  • not recommended for full-frame cameras
  • Super Multi-Layer Coating minimizes reflections and flare
  • ultra-wide field of view is ideal for artistic shots and unusual perspectives of weddings, sports, and underwater subjects (protective housing required)
  • slip-in gel filter frame at rear of lens
  • minimum focusing distance: 5.3"
  • constructed of 13 elements in 9 groups
  • lens is 3" in diameter, 3-1/8" long
  • weight: 16.6 oz.
  • carrying case, front adapter ring, front and rear lens caps supplied
  • warranty: 4 years
  • Our 60-day money-back guarantee
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Preliminary info from the manufacturer

Features and Specs

Brand Compatibility Canon
Image Stabilization No
Focal Length 4.5mm
Maximum Aperture f/2.8
Weight 16.6
Parts Warranty 4 Years
Labor Warranty 4 Years