I have a Nikon SB-600 flash. When it works it's perfect and works as long as I keep using it. If I leave it for a while, hours or days, it usually won't work first time. I have to press the ON/OFF button numerous times, maybe a couple of hundred and it will usually start. The batteries are always good and I've checked the connections for the batteries inside the flash. What is wrong?
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Could you provide some details? How does it not work? Does the D90 not turn on? Does it take a picture but the flash doesn't go off? What exposure mode(s) are you using?
From the Nikon site, do you have one of these flash units.
Support for the Nikon Creative Lighting System when using SB-900, SB-600, or SB-400 Speedlights, or the SU-800 Wireless Speedlight Commander
If so You set the flash mode to "comander" the pop up flash must be UP
It maybe because it overheated he flash tube, nikon flash guns use a thermal cutout, to prevent overheating, usually after approximately 30 / 40 shots, in quick succession. It should start working again after it cools down.
If not you may need to get it checked at Nikon Service Centre.
Cheers
Ian
Definately a settings problem. The camera will only syncronize on one specific speed. Youe best bet is to use auto. For manual, you'll have to set the shutter speed at the sync speed.
1) i-TTL: TTL flash control by 1,005-pixel RGB sensor, built-in flash, SB-800, SB-600, SB-400: i-TTL balanced fill-flash and standard i-TTL flash 2) AA (Auto Aperture-type) flash: Available with SB-800 used with CPU lens 3) Non-TTL Auto: Available with Speedlights such as SB-800, 28, 27, and 22S 4) Range-priority manual flash; available with SB-800
Flash Control
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