The 4.5mm F2.8 EX DC Circular Fisheye HSM is a true fisheye optic for crop cameras, projecting a circular 180-degree image onto APS-C sensors. This lens sports a focal length of 4.5mm and maximum aperture of F2.8, Sigma's HSM ultrasonic-type focusing and SLD low-dispersion lens elements. Aside from 'edgy' skateboarding shots, circular fisheyes are actually quite useful for astrophotography and scientific applications.

Product timeline

Sigma 4.5mm EX DC Circular Fisheye HSM

Nov 14, 2007

Quick specs

Lens type	Prime lens
Focal length	4.5 mm
Image stab.	No
Lens mount	Canon EF-S, Nikon F (DX), Pentax KAF3, Sigma SA Bayonet, Sony/Minolta Alpha
Max aperture	F2.8
Min aperture	F22
Min focus	0.14 m (5.31″)
Weight	470 g (1.04 lb)
Length	78 mm (3.06″)

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