This huge Sigma APO 200-500mm F2.8 EX DG ultra telephoto zoom lens has been available for Canon DSLRs for some time, and now, it’s also available for the Nikon mount. The lens covers the 200 to 500mm zoom range and maintains its fast F2.8 aperture all throughout. With a dedicated APO Tele-Converter 2x EX DG …
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