I have been a SIGMA user since my father’s generation, I still use lenses from that period even now. Indeed green tints occasionally appear due to its age, but it’s to my taste. I recently started using the 24-70mm F2.8 IF EX DG HSM and 10-20mm F3.5 EX DC HSM. I enjoy kayaking as a hobby and recently took the 24-70mm lens with me. It may have been the good focus speed but the ease of the AF made it fun (laughs). Besides, the ring feels solid. I strongly feel SIGMA is a manufacturer that remembers the “joy of making things” over how its products will end up being used.