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MAMBO YA SIGMA Photographers mpoooo Sigma is introducing the world's first ultra-telephoto zoom to deliver an f/2.8 aperture at a focal length of 500mm. Announced in Las Vegas during PMA's annual trade show, the APO 200-500mm offers users the same fast aperture throughout its zoom range, and with an extra dedicated attachment, extends the focal range up to 1000mm. This extra 400-1000mm length is offered at f/5.6. cheki bei yake. The lens, with Sigma, Canon and Nikon mounts, weighs 15.7kg, and is available for £16,000. hii ni kwa wapiga snap wanaomaanisha tu.