If you mean the Sigma 50-200mm f/4-5.6 DC OS HSM lens, then it uses a 55mm filter. The lens should give the filter size somewhere near the front. You can also take a ruler and measure the diameter of the filter mount.
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If you mean the Sigma 50-200mm f/4-5.6 DC OS HSM lens, then it uses a 55mm filter. The lens should give the filter size somewhere near the front. You can also take a ruler and measure the diameter of the filter mount.