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How can you test a camera before use to be sure the flash sync is working properly.

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Set camera up and aim at a blank wall. Place flash on camera, fire off test shots with camera set to flash sync speed and lens set to wide angle (eg 18 mm), ensure flash matches angle of lens. 
You will probably have to turn auto focus off, so that camera will fire, after taking photo/s use review to ensure that you have a nice even coloured piece of wall.
Any problems either with camera sync problems or flash coverage will show up in the test shots.
Camera sync, will show as part of the frame only exposed, for example you may find a horizontal line approximately 1/3 to 1/2 of frame with a proportion of the frame dark.
If you have flash "drop off" you will find the corners of your frame will be dark, you need to ensure that your flash angle specified on the flash and the focal length of the lens match.
Hope this helps Ian

Posted on Aug 14, 2009

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Check the flash sync speed on the cameras. With most film cameras, the flash sync speed is 1/60 of a second.

With digital cameras, you must use a flash rated for the digital camera and use their recommended flash speed.

If the camera to flash sync speed is correct it is possible that the flash output is weak. This would be due to the battery not being able to properly supply, or some defective components in the flash circuits.

You will require a flash sync detector, a flash intensity meter, and a battery load tester to perform the the first level of basic tests if you wish to analyse the fault yourself.

This is not a problem you could service yourself, unless you are experienced and knowledgeable for servicing flashes.

These flash units use very high voltage at a very high current when operating. The current is built up and stored in a very efficient high voltage capacitor. A flash can be dangerous to service yourself.


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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
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    3) try your camera with a different power pack to confirm your camera is triggering the power pack OK.
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