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Is it one of those slave units containing a light sensor which are used to remotely fire additional flash units without running wires between the units.
 
scifan57 said:
Is it one of those slave units containing a light sensor which are used to remotely fire additional flash units without running wires between the units.

Spot on
Over to you now
 
What is this pattern in the cardboard?
How is it used?
image-1528422927.webp
 

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