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Sigma's 4.5mm F2.8 EX DC Circular Fisheye HSM lens is the first designed exclusively for use with APS-C size digital SLR cameras. Its180 degree angle of view in all directions produces a circular image within the frame. The fast f/2.8 aperture provides a bright image in the viewfinder, making it an ideal lens to use in low light conditions. The minimum focusing distance of 13.5cm/5.3inch and maximum magnification of 1:6 make it particularly useful for close-up photography.
SLD (Special Low Dispersion) glass provides effective compensation of chromatic aberration, while Sigma’s Super Multi-Layer Coating minimizes flare and ghosting. The lens is equipped with an inner focusing system that creates high definition and good image quality over the whole frame. The HSM (Hyper Sonic Motor) ensures fast and quiet autofocusing and allows full-time manual focus override by rotation of the focus ring.
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