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, which do not have a full 36x24mm sensor.[1] This lens is available in Canon, Nikon, Sigma, Pentax and Sony mounts.
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Maker | Sigma Corporation |
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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 |
Features | |
Short back focus | ![]() |
Lens-based stabilization | ![]() |
Macro capable | ![]() |
Unique features | circular fisheye |
Physical | |
Max. length | 77.8mm |
Diameter | 76.2mm |
Weight | 470g (16.6oz) |
Filter diameter | rear (Gelatin filter) |
Accessories | |
Lens hood | none |
Angle of view | |
Horizontal | 180 |
Vertical | 180 |
Diagonal | 180 |
Retail info | |
MSRP | $1400 USD |
This lens projects a 13mm image circle, which fits nicely in a Micro Four Thirds system frame with an adapter.
See also
editReferences
edit- ^ "Sigma 4.5mm F2.8 EX DC Circular Fisheye HSM". Retrieved 2009-08-21.