The Sigma Corporation, a well known name in the field of lens manufacturing is proud to publicize the launch of their new 4.5mm F2.8 EX DC CIRCULAR FISHEYE HSM lens. This auto focus circular fisheye lens has an angle of view of 180 degrees in all directions and is entirely designed for digital SLR cameras with the APS-C size image sensor. The F2.8 large aperture value generates a clear image in the viewfinder and let photographers to capture pictures even in low light situations, making the lens perfect for Astrophotography and Aurora photography.

Because of its quantifiable angle/area relationship it make, this lens can also be used for scientific and arts functions like solid angle measurements of cloud distribution over the sky or vegetation distribution of a particular forest etc. The lens has got lowest focusing distance of 13.5cm/5.3inch and maximum magnification of 1:6 due to which the lens is functional for close-up photography.

The 4.5mm F2.8 EX DC CIRCULAR FISHEYE HSM lens from Sigma’s employs Super Multi-Layer Coating and thus reduces flare and ghosting. The lens also incorporates an inner focusing system that makes high definition and good image quality on the whole frame. Its Hyper Sonic Motor makes sure fast and silent auto focusing and let full-time manual focus override by rotation of the focus ring. The lens measures about (Diameter x Length) Ø 76.2mm X 77.8mm and weights around 470g. There is no word on the pricing and availability.