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
