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Interesting Article About Slow Shutter Speed In High Speed Flash Photography

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#1 Ron W

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Posted 14 February 2019 - 10:43 AM

Certainly counterintuitive, but true. I use this MIOPS trigger for lightning shots. Works well.









#2 Wheatsack


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Posted 14 February 2019 - 01:35 PM

Interesting article Ron.

Peter................................................ f8....and be there....

#3 Sailjunkie


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Posted 14 February 2019 - 02:14 PM

Good read.  Many thanks, Ron.  :)


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#4 Gary Poole

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Posted 14 February 2019 - 08:00 PM

This is an extension of the basic theory of flash photography.  When you use flash there are 2 exposures:

  1. The ambient light exposure.  This is controlled by the aperture, shutter speed, and ISO.  This is the image we would get without flash.
  2. The flash exposure.  This is controlled by aperture, ISO, the flash intensity and duration, and the square of the distance of the subject from flash.  The flash exposure is very fast, 1/1000 sec or less, depending on the flash settings.  The only shutter speed requirement is that it be slow enough so that the shutter is fully opened when the flash fires.  On most cameras this is 1/250 or 1/200 sec. and slower.

These 2 exposures are superimposed on a single image.


As the author of the article demonstrates, if we set up our camera for a very small ambient exposure, the ambient part of the image goes black and the only visible exposure is caused by the flash.  We do just the opposite of this for fill flash.  We set the camera for the ambient light and slightly underexpose the flash exposure.

Gary in SE Michigan, USA
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