Question about Nikon Speedlight SB-600 TTL Flash

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I put fresh batteries in my sb 600, i took a few pictures and then the flash was not as powerful and 2 red lights kept flashing on the front, why?

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  • 73 Answers

Ok, there are several things to consider. First of all, don't use standard alkaline batteries, the flash needs a lot of power and will drain those quickly. Use either lithium batteries (most powerful non-rechargeable) or invest in NiMH rechargeable batteries. Those would be your best choices for AA's.
Now to your flashing red lights - on the Speedlight flash they fulfill 2 functions, one is as auxiliary ready lights (if used as wireless remote flash) but the blinking in your case points to their other function - it blinks 3 times to indicate possible under exposure of your photos at maximum output level. It's basically telling you that the flash was not strong enough to properly illuminate the scene you tried to shoot. That doesn't necessarily mean the batteries are going flat, but you could simply be out of range of the maximum flash power. Your flash has a guide number of 30 - that means at a zoom head position of 35mm (if your lens is at 35mm) and your ISO is 100, then the maximum range of the flash is 30m (approx. 68ft). If your subject is further away, you would get an underexposure warning (3 blinks of the ready lights).
Hope that helps explain some things.

Posted on Jul 29, 2010

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1 Answer

Bought a Nikon Speedlight SB-600 in August. Tested the flash and it fired ok. I took out the flash a few days ago to use at a graduation and the "ready" light did not come on. Consequently it did...


Hi grwcamp, Sorry to hear about it not working at the graduation. Are in the correct position (I am sure you did but, we must start someplace). Look inside, see if there is battery acid in there.
If with new/fresh batteries it still does not work call Nikon. You have a warranty on it so it should be covered.
Nikon digital 1-800-645-6689

Dec 04, 2010 | Nikon Speedlight SB-600 TTL Flash

1 Answer

There is some annoying noise coming out everytime i use the sb-600 flash!


If it is a whining noise that increases in pitch, that is the capacitor that powers the Xenon strobe that is in the flash. The whine might be a little less with fresh batteries, but it is normal and unavoidable.

Feb 14, 2010 | Nikon Speedlight SB-600 TTL Flash

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SB 600 has stopped firing batteries are good


flash bulb could be burnt out...if it doesn't fire when when you push test, that's my guess as to the problem. Another possibility (although unlikely) is a loose connection in the flash.

Oct 23, 2009 | Nikon Speedlight SB-600 TTL Flash

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My sb 600 fires with the camera but it seems not illuminate


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.

Flash Sync Speed
  • up to 1/250 X-Sync Speed
  • up to 1/8000 FP High Speed Sync
  • Red-eye reduction
    Red-eye reduction with slow sync
    Rear-curtain sync
    Slow sync
    Front-curtain sync (normal) Flash Sync Modes
  • 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
  • Mar 13, 2009 | Nikon Speedlight SB-600 TTL Flash

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    SB-600 will never be on ready


    The capacitor may be weak, or there is a problem at the component level that is not allowing the inverter to reach full voltage.

    The flash will need shop service.

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    my sb 600 speedlight won't turn on. Do I need to reset it? It has fresh batteries. Never been dropped

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    Check that all the batteries are functioning properly, and that they have been inserted in the proper direction.


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    Fried Unit


    Mixing the batteries should not have damaged the flash. More likely the smoke came from the odd battery.

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