This lens was redesigned in 1988 for the Maxxum Series-i cameras. Internal changes include a faster focusing gear and a new IC ROM to enable faster focusing with Series-i, xi, and si cameras. External changes include AF lock/lens function button (one for 200mm, two for 300mm and 600mm lenses). Additionally, the 80-200mm f/2.8 APO received a stronger focusing shaft which enabled better focus tracking, a rubber focusing grip for easier manual focus.