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Flash Sync speed explained

December 06, 2013  •  Leave a Comment

The fun way to test the flash sync speed of your camera.

Set up the camera on a tripod with your studio flash.

Adjust your camera shutter speed one step at a time (1/3 stop normally) to increase exposure. Start at 1/125th sec and take a photo using your timer at each setting and see the results.

What is happening? As the shutter opens and closes it is dragging a 'curtain' across to expose the sensor to the light. If you use a fast shutter speed the curtain interrupts the flash (in this case from the bottom of the lens) and leaves a dark underexposed area behind. The faster the shutter speed the more of the flash light is interrupted.

In this case my camera flash sync speed would be something short of 1/250th sec (at 1/125th sec)

 1/250th sec

 1/320th sec

 1/400th sec

1/500th sec

1/640th sec

1/800th sec

Of course you could always read the instructions (RTFI) but thats not as much fun!  This makes it easier to understand and remember.

Enjoy

Glenn


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