You won't believe how big this lens is, even after we've told you that you won't believe how big it is. It's b-i-g. Affectionately known as the "Sigmonster", this is currently the longest lens available for Nikon DSLRs. What else do you need to know about it?
This lens can be used with a Sigma APO Tele Converter, for those occasions when you're trying to photograh a tiny bird from 100m away. The 1.4x TC makes it a 420-1120mm f/8 lens, and the 2x TC makes it a 600-1600mm f/11 lens. Insane. The 1.4x TC will retain autofocus with a D4, D600 or D800 camera, but the 2X TC will require manual focussing.
(Actually, having said it's insane, we once had a customer hire a 300-800mm lens and a 2x Tele Converter for some covert surveillance work. We did some tests and calculated that in principle he could take a recognisable photo of someone from about a mile away!)
COMPATIBILITY NOTE: This Sigma lens is for Nikon cameras only. We also stock the same lens for Canon cameras: click here.