Nikon's first high-end i-TTL only flash unit, the SB-900 dropped support for film and D-TTL cameras except in Automatic and Manual flash modes. The SB-900 is notorious for overheating in constant use and shutting down, as it has an internal thermal detector.
Guide Number (ISO 100 FX): 111 ft, 34m @ 35mm
Weight: 14.6 ounces (415g)
Power: 4 AA batteries, external
Recycle time: 2.3 seconds (NiMH)
Max Flash Duration: 1/880
Coverage: 14mm, 17mm, 18mm, 20mm, 24mm, 28mm, 35mm, 50mm, 70mm, 85mm, 105mm, 120mm, 135mm, 180mm, 200mm
35mm film TTL support: No
D-TTL support: No
i-TTL (CLS) support: Yes
Auto Aperture: Yes
Automatic Flash mode: Yes
Manual Flash mode: Yes (8 levels)
Head tilt: Yes
Head rotate: Yes
AF Assist: Yes
High Speed Sync: Yes, Auto (i-TTL)
Repeating Flash: Yes
Modeling light: Yes
PC Sync socket: Yes
LCD: Yes
Foot style: Flip lock
Flash Value lock: Yes
Flash Color info: Yes
Wireless: Yes (I-TTL preflash only)
Other: includes stand, filter set, diffusion dome
