Hi guys, I have a question to ask, as I checked this lens Tokina AT-X 828 AF Pro 80-200mm f/2.8 on tokinalens main site and found out that it have IF. But when I use with my D3100, the AF doesn't work.. any1 know why?
Internal Focusing (IF) is different from Built-in Motor (BIM). D3100 requires lenses to have BIM to focus. IF just means that the lens will not extend when focusing.