SB-400 main details
Type - Automatic Insulated Gate Bipolar Transistor (IGBT) and series circuitry
Guide Number - 98.4ft or 30m (ISO 200), 69ft or 21m (ISO 100)
Auto Settings - i-TTL, M (manual, only with the D40)
Angle of Coverage - Light distribution covers an 18mm lens when mounted on a Nikon DX format camera and a 27mm lens when mounted on an F6
Recycle Time - Approx. 3.9 seconds with AA Alkaline manganese batteries, 4.2 seconds with AA Lithium batteries
Special Features - Minimum Number of Flashes Approx. 140 (Alkaline) 250 (Lithium)
Flash exposure control set on the Camera - Slow-sync, Red-eye reduction, Rear-curtain sync flash, FV Lock flash, manual flash (with Nikon D40 Digital Camera)