The Canon EF 8–15mm 4L Fisheye USM is a fisheye zoom lens

Zoom lens

A zoom lens is a mechanical assembly of lens elements for which the focal length can be varied, as opposed to a fixed focal length lens...

 for Canon

Canon Inc.

is a Japanese multinational corporation that specialises in the manufacture of imaging and optical products, including cameras, camcorders, photocopiers, steppers and computer printers. Its headquarters are located in Ōta, Tokyo, Japan.-Origins:...

 digital single-lens reflex camera

Digital single-lens reflex camera

Most digital single-lens reflex cameras are digital cameras that use a mechanical mirror system and pentaprism to direct light from the lens to an optical viewfinder on the back of the camera....

s (DSLRs) with an EF lens mount

Canon EF lens mount

Introduced in 1987, the EF lens mount is the standard lens mount on the Canon EOS family of SLR film and digital cameras. EF stands for "Electro-Focus": automatic focusing on EF lenses is handled by a dedicated electric motor built into the lens...

. It delivers 180° diagonal angle of view images for all EOS SLR cameras with imaging formats ranging from full-frame to APS-C, and provides 180° circular fisheye images for full-frame EOS models. It features UD glass for suppression of chromatic aberration and a Subwavelength coating for reduced ghosting. It has full-time manual focus for instant switching from AF to Manual operation.

Firsts

This lens broke new market ground in several respects:

• It is the first Canon-branded lens to offer 180° circular fisheye images for any sensor format.
• It is the first zoom fisheye lens for any DSLR to offer a full 180° angle of view in both circular and rectangular image formats.
• It is the first lens by any manufacturer to offer a 180° angle of view for APS-H (1.3x crop factor) bodies.
• Also, it is the first zoom fisheye lens to offer a 180° angle of view on both full-frame and cropped bodies.

Specifications

• Canon EF 8-15mm f/4L Fisheye USM