EXTREME FISHEYE Fits right over your camera's existing lens system, allowing you to get more in the picture, include more of the landscape, more people in group picture, and interiors show more of the room. Perfect lens for extreme sports, skateboarding, skydiving bike jumping etc.... It also has the separate Macro lens, that can be used for very detailed close up pictures. Truly 2-in-1 photographic solution. The SF-4000 Bounce Zoom Slave Flash from can be used as both a normal bounce zoom flash with tilt up to 90° or as a slave. This flash features 4 slave modes that allow it to work with cameras that fire their built-in flash immediately or cameras that have a single or multiple flash red eye reduction system. The SF-400 has a multi-angle 3-position zoom head that covers wide angle, normal, and telephoto distances. It runs on 4 AA batteries.