Sigma 4.5mm f/2.8 EX DC Circular Fisheye HSM lens

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Sigma 4.5mm f/2.8 EX DC circular fisheye
Sigma 4.5mm circular fisheye lens.jpg
Maker Sigma Corporation
Technical data
Type circular fisheye lens
Focus drive Ultrasonic motor
Focal length 4.5mm
Crop factor 180 degrees
Aperture (max/min) f/2.8
Close focus distance 13.5cm
Max. magnification 1:6
Diaphragm blades 6
Construction 13 elements in 9 groups
Short back focus No No
Lens-based stabilization No No
Macro capable No No
Unique features circular fisheye
Max. length 77.8mm
Diameter 76.2mm
Weight 470g (16.6oz)
Filter diameter rear (Gelatin filter)
Lens hood none
Angle of view
Horizontal 180
Vertical 180
Diagonal 180
Retail info
MSRP $1400 USD

The Sigma 4.5mm f/2.8 EX DC circular fisheye is a photographic lens manufactured by Sigma Corporation. It is a circular fisheye lens, designed to project a 180-degree field of view in all directions onto a circular image. It is the first such lens to provide the complete circular fisheye effect on crop factor digital SLR cameras that do not have a full 36x24mm sensor.[1] This lens is available in Canon, Nikon, Sigma, Pentax and Sony mounts.

See also[edit]