Industrial pictures, if you have access to the situations, can be
impressive and have saleable value. This one has been in a
magazine and is a colour slide originally.

Take care, such pictures can also be dangerous to take.

I arranged with the man before setting up the shot, where he
would direct his burning sparks. We also agreed a signal for him
to start.

The camera was set up, on a tripod, with a 70/210 lens to keep it
well away from the 'action'. The flash distance was then
calculated and the exposure set manually from this information.
Auto exposure would probably have led to over exposure due to the
dark background.

A slow shutter speed was chosen as the flash would be the REAL
shutter speed, freezing the instant, whilst the camera shutter -
about 1/15 sec - would only record the sparks - giving the light
trails.

A flash meter is ideal in these situations.

I then gave the start signal and shot a number of frames.