Hello
I'm considering buying some tungsten lamps, and have some specs from various man ufacturers. Most detail the light output as either 'lux' or 'foot candles' at v arious distances. I'd like to know if there is a formula that would allow me to convert these figures into f-stop/shutter-speed and film-speed combinations so that I can work out which lights will afford me enough depth of field and a fast enough shutter speed for portraiture.
I don't live near any dealers, so am unable to take a meter reading of the diffe rent lamps, and most of the lamps are sold through film/video dealers who are no t clued-up on stills-photography.
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