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The model tested had the PentaxK mount Introduction The Sigma 816mm f/4556 DC HSM is presently the widest rectilinear lens out on the market at 8mm it is fieldofview is 114°Information about the SIGMA's outofproduction lens 816mm F4556 DC HSMFLD glass is supposed to deliver a similar characteristic like fluorite glass which is only used in a handful of expensive lenses to correct color aberrations and the Sigma AF 816mm f/4556 DC HSM has 4 of 'em It is a dedicated APSC lens with a fieldofview equivalent to a 1256mm full format lens Buy Sigma 8 16mm F 4 5 5 6 Dc Hsm Ultra Wide Zoom Lens For Select Nikon Dslrs Production Gear Ltd Broadcast And Professional Cameras Accessories Sigma 8-16mm f4 5-5 6 dc hsm sony