What's more, when shooting with Focus Predictive Control via the camera's AI Servo AF mode, lens drive continues until the exposure is made. This increases the normal AI Servo AF continuous shooting speed from 2 fps (without Booster) to 5 fps (set at CH) while maintaining sharp focus on moving subjects Sequence shots of 500cc rider Haruchika Aoki astride his GP bike using the Canon EOS-1N with Power Drive Booster E1 in AI Servo AF mode. << Back to Main . 1 . 2 . 3 . 4 . 5 .