With the Red Rose Cave & Pothole Club,
Casterton Fell, Saturday 11 April 2015.
This was the first serious outing for my Firefly 3 Slave Unit. As I discovered there were
problems with light from the camera's built-in flash reflecting from mist in the cave. I was
advised to stick a dark film over the camera's flash, which still allowed infra-red light from it
to trigger the Firefly thus eliminating the problem as I was to discover on subsequent trips.
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