 BetterPhoto Member |
strobe power i am trying to sort out issues in order to purchase stobe lights/monolights how can I accurately determine how much power I need? i want to shoot 100 ASA film at f8 bounced into umbrella(white) or a soft box groups of 6 people lights 10 feet away i have heard many differing answers and to confuse the issue more - am understanding that the watts sec issue is not a true indicator of light output! variance brand to brand? how big an issue is this?
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Michael H. Cothran |
Watt Seconds is actually a valid means of determining strobe power, but a lot depends on the quality and angling of the reflector being used. Also, many manufacturers do fudge their ratings. Go to some strobe sites. Legitimate strobe manufacturers like Novatron, Speedotron, Paul C. Buff, Dynalite will not only list the WS for each of their units, but will also provide you with actual shooting f-stops @ 10 feet. Since most soft boxes and white umbrellas lose 2 stops of light, you can easily predict what f-stop you can use. Michael H. Cothran
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