The new condition Sigma 105mm F2.8 EX DG OS HSM in the Canon and Nikon systems is on sale for $569 with free shipping and 4% promotional rewards at B&H Photo or with free extra lens-accessories instead at Adorama. Or if you are a Prime member, you can get 5% back if you pay with one of Amazon’s own payment vehicles (Chase VISA or Store credit card).
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