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Type:4.5mm Circular Fisheye for use with APS-C size Canon Digital SLRsMinimum Focusing Distance::5.3in / 13.5cmMaximum Aperture:F2.8Minimum Aperture:F22Angle of View:180°Lens Construction:9 Groups 13 ElementsMaximum Magnification Ratio:1:6Filter Diameter:Insertion-type gelatin filter into rear of the lensDiaphragm Blades:6pcsWeight::16.6oz / 470gDimensions::Diameter x Length: 3'' x 3.1'' / 76.2mm x 77.8mm・The first 180 degree circular fisheye lens designed specifically for APS-C size digital SLR cameras・Fast F2.8 maximum aperture making it ideal for low light photography・Minimum focusing distance of 13.5cm and a maximum magnification of 1:6・SLD glass minimizes color aberration・Equipped with HSM with full-time manual focus override・Equisolid angle projection method is possible for art and scientific useThe first Circular Fisheye Lens exclusively for use with APS-C size digital SLR cameras... 4.5mm F2.8 EX DC Circular Fisheye HSMThis auto focus circular fisheye lens has an angle of view of 180 degrees in all directions. It is exclusively designed for digital SLR cameras with the APS-C size image sensor. When used in conjunction with digital SLRs with APS-C size image sensors it produces circular image within the frame.The F2.8 large aperture value produces a bright image in the viewfinder and allows photographers to take pictures in low light conditions making it an ideal lens for Astrophotography and Aurora photography.Due to the quantifiable angle/area relationship it produces this lens can be used for scientific and arts applications such as solid angle measurements of cloud distribution over the sky or vegetation distribution of the forest.The minimum focusing distance of 13.5 cm/5.3 inch and maximum magnification of 1:6 make It's particularly useful for close-up photography.SLD ''Special Low Dispersion'' glass provides effective compensation of chromatic aberration. Sigma's Super Multi-Layer Coating minimizes flare and ghosting. It 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.