Quite possibly but the lens that started the process was a very early Sigma 28-70 f2.8 with a mechanical focus coupling. The intermediate one was much newer, can't remember how it focused but I only had it a week or so. I decided that, as I would be upgrading bodies at some stage, I would just buy Nikon lenses and not have the worry that one, or more, lenses might need a software upgrade in the future. Even if i were to buy new Sigma lenses there is no guarantee that they would work with a later body. Sigma lenses are optically very good but the interface puts me off.