Sigma EX 4,5mm f/2,8 DC HSM Fisheye Specifications

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Name Sigma EX 4,5mm f/2,8 DC HSM Fisheye

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Manufacturer Sigma
Release Date and Price
Release Year 2007
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Lens Type
Lens Type Wide Angle Lenses
Wide Angle Lenses with Fisheye-character
Zoom or Prime Prime lens (no possibility to zoom)
Mount and Compatibility
Mount Canon (see compatible cameras)
Nikon (see compatible cameras)
Compatibility Designed for APS-C cameras (see compatible cameras)
Closest Focusing Distance 13 cm
Autofocus (AF) Yes
Built-in autofocus (AF) motor Yes (more info)
Maximum aperture f/2,8
Elements: 13 elements / 9 groups
Focal Length 4 mm

This is a "DC" lens, designed for APS-C sensors, and will have a focal length equivalent to: 
On Canon cameras: 6 mm
On Nikon cameras: 6 mm

Read more on the cameras impact on the perceived focal length
Diameter 76 mm
Length 77 mm
Weight 470 g (see the total weight, camera+lens)
Image stabilization No
Filter Built-in Filter Holder
Lens Hood Not included
Tripod mount No (Read more)
Weather sealing No

Product description from Sigma

At launch 2007 Sigma wrote this regarding Sigma EX 4,5mm f/2,8 DC HSM Fisheye:

"Sigma’s 4.5mm F2.8 EX DC Circular Fisheye HSM creates an image that is a circular, curved, distorted view of reality when used on a digital SLR camera. One of the most unusual lenses a photographer can use as it produces a circular image within a black surrounding frame. It is ideal for landscapes and panoramic photography. Because of its equisolid angle projection system, the lens can be used for scientific applications. The minimum focusing distance of 5.3 inches allows the photographer to have fun with placement of subjects extremely near to the camera with distorted backgrounds. SLD (Special Low Dispersion) glass employed for effective compensation of color aberration, Super Multi-Layer lens coating reduces flare and ghosting and assures high image quality throughout the entire zoom range. In the hands of a photographer looking for creative expression and the opportunity to explore and create, this is the ultimate creative tool. The results are captivating

For use with smaller chip APS-c cameras only

The circular field of view produces striking images with exaggerated perspective of near subject & extreme barrel distortion of the surrounding areas

HSM (Hyper-Sonic Motor) ensures a quiet & high-speed auto focus

The minimum focusing distance of 5.3 inches & a magnification ratio of 1 to 6 allows subjects to be as close as ¾ of an inch from the lenses’ front element.

A front cap adapter, front/rear lens cap and carrying case are included with the lens."

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