Mark has a light meter he takes almost everywhere, used so much the printing on the buttons has gone. It’s a piece of equipment all photographers with stobes are encouraged to purchase. Having used one in a studio that was reporting values at least a full stop out I was reluctant. Mark explained that sort of things okay if it’s always your meter you’re using, you just get used to it and compensate. Having set his F-stop to the required value for the shot he goes about metering any ambient, key, fill or rim light sources, looking for meter readings above and below his working aperture.
It occurred to me that when using the Expodisc I not only get an indication of the colour of the light but its exposure. Shooting in P mode, the camera changes the aperture and shutter speeds to get a good exposure resulting in the spike in the middle of the histogram.
And an Expodisc doesn’t need batteries and can easily be stored in any already full kit bag. If you use this technique ensure you photograph the lights from the subject location, not closer or further away as you’ll impact the results by approx 1 stop per meter.