I am selling the 400mm Sigma APO Tele-Macro. This is widely known on the net to be the last iteration of this lens before it was discontinued. Nowhere in my research have I ever encountered a HSM version for nikon, yet I have one buyer insisting that such a lens exists. To my knowledge, Sigma lenses of that era did not have HSM incorporated for nikon mounts, such as the situation now for Sigma lenses for KM mount.
However, this buyer remains unconvinced and suggests that my claim that the lens is the last iteration is misleading.
Any enlightened forumners out there who have evidence that such a lens(Sigma 400mm f5.6 APO Tele-Macro HSM Nikon Mount) exists?