Sigma EX 50-500mm f4.5-6.3 APO HSM OS for Nikon FThe Sigma EX 50 500mm f4. 5 6. 3 APO HSM OS is the famous "Bigma" lens, with a huge 10x telephoto zoom range (and a correspondingly huge size.) This is not an easy lens to handhold, but it has a generous handgrip on the tripod foot and an optical stabilizer to give you a good shot at it, anyway. In excellent condition, with hood, hood extender for APS C, and case.