Question about Nikon Speedlight SB-800 TTL Flash

1 Answer

D300, SB-800 fires but no exposure.

I shot a wedding last week... all of a sudden, in the middle of the ring exchange, I noticed my images had no exposure - my display was showing me an almost black image. I wanted to panic. What did I do wrong? I was in manual mode, and my D300 was not indicating an F/stop on the top display. I quickly checked everything but could not find anything wrong. I powered off/on camera & nothing. I then dismounted the SB800 & things went back to normal. Hmm...

I was using a Quantum Turbo Battery power pack for the SB-800. Can this have anything to do with this problem? Today I looked at the image info of several images I took with & w/out the power pack. W/out the power pack the data appears normal & images taken w/the battery pack show abnormal settings, to include, Focal Length 0 mm, and F-Number F/0. I was also using a Tamron 17-50mm F/2.8 XR Di II LD Aspherical (IF) lens. (Can't afford the Nikon version, yet).

Image info on shots that turned out ok, using the power pack & the 17-50mm also showed some strange stuff; Focal length: 5mm, F-Number: F/95. Is this normal? Is my lens giving it incorrect data? The flash did fire each time I pressed the shutter release. I didn't even notice a sync problem, although one would think so. Help! What am I doing wrong? or is this equipment incompatability?

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  • n4ldg Jul 15, 2009

    Well... It appears that the puzzle is solved. It's the Tamron 17-50mm Lens. It has a problem communicating with the camera. I called Tamron, and explained the problem and gave them the image info for several images I shot with that lens, to include the blacked-out ones. The tech said it was a communications defect between the lens talking to the camera. Tamron has a 6 year warrantee for their lenses. So the repair will be free. Before I send it in, I plan on conducting a few more test shots with some settings that could possibaly be a contributor to this issue. Stay tuned.



    So, the Quantum battery pack is not the issue, as it does well with other lenses. Also the flash still requires 4 - AA, to run the computer in the flash. When the the Quantum battery pack is connected to the High Voltage connector in front of the SB-800, it takes over the charging of the capasitors. The flash switches the AA batteries to run the computer only. - Louis

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Thats is odd.
When you hook everything up, do you turn on the flash last?
It sounds like the battery pack is giving the flash a different voltage then it should have causing incorrect readings and exposures.
I would send the pack back to Quantum(located in Ronkonkoma, NY) and have them check it.

Posted on Jul 14, 2009

  • Larz Jul 15, 2009

    Wow, that is odd, but I am glad you got it arrowed down.


    Sorry my info was not correct.

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