191lOther Flash UnitsThe following flash units can be used in non-TTL auto and manualmodes. If they are set to TTL, the camera shutter-release buttonwill lock and no photographs can be taken.D Notes on Optional SpeedlightsRefer to the Speedlight manual for detailed instructions. If the Speedlightsupports the Nikon Creative Lighting System, refer to the section on CLS-compatible digital SLR cameras. The D3X is not included in the “digitalSLR” category in the SB-80DX, SB-28DX, and SB-50DX manuals.i-TTL flash control can be used at ISO sensitivities between 100 and 1600.At values over 1600, the desired results may not be achieved at someranges or aperture settings. If the flash-ready indicator blinks for aboutthree seconds after a photograph is taken, the flash has fired at full powerand the photograph may be underexposed.Speedlight SB-80DX,SB-28DX,SB-28, SB-26,SB-25, SB-24SB-50DXSB-30, SB-27 1,SB-22s, SB-22,SB-20,SB-16B, SB-15SB-23, SB-29 2,SB-21B 2,SB-29s 2Flash modeA Non-TTL auto ✔ — ✔ —M Manual ✔ ✔ ✔ ✔G Repeating flash ✔ — — —REAR Rear-curtain sync ✔ ✔ ✔ ✔1 Flash mode is automatically set to TTL and shutter-release is disabled. Set flashunit to A (non-TTL auto flash).2 Autofocus is only available with AF-Micro lenses (60 mm, 105 mm, or 200 mm).
