PetaPixel

How to Turn an On-Camera Flash into a Transmitter for Optical Sensors

Optical sensors are a cheap way to trigger slave flashes if you don’t want to pay for a wireless transmitter, but the fact that you’re firing your on-board flash to trigger the sensors limits your creative options. Flickr user Victor came up with the idea of turning an on-camera flash unit into an infrared transmitter by covering up the flash with a filter. The filter is simply a piece of processed (but unexposed) E6 slide film — it blocks visible light, making it completely black, but allows infrared light to pass through and trigger optical sensors.

Using Infra Red Masters To Trigger Optical Slaves [DIYPhotography]


Image credit: Photographs by Victor W.


 
  • Amando96

    Wonder if Xray film thing works too?

  • Joey Miller

    This is a really old hack. I use the same thing on my SB-900 when I use it as a commander.  When my ISO is 800 or above, I have to use the filter to keep the signal light from contributing to the exposure.