Sigma 4.5mm f/2.8 EX DC Circular Fisheye HSM lens
|Type||circular fisheye lens|
|Focus drive||Ultrasonic motor|
|Crop factor||180 degrees|
|Close focus distance||13.5cm|
|Construction||13 elements / 9 groups|
|Short back focus||No|
|Unique features||circular fisheye|
|Filter diameter||rear (Gelatin filter)|
|Angle of view|
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. This lens is available in Canon, Nikon, Sigma, Pentax and Sony mounts.
- "Sigma 4.5mm F2.8 EX DC Circular Fisheye HSM". Retrieved 2009-08-21.
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