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05-05-2010, 08:04 PM - 1 Like   #16
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Several people have mentioned guide number but haven't explained it. At a given flash power, the guide number comes from a chart that gives distances and apertures. The wider the aperture the farther the flash distance. On many flash units that chart is printed on the back of the flash.

With a manual lens you don't set the aperture in the camera as you would with an auto lens. There's a ring on the lens itself that you adjust. If you are getting too strong a flash try a smaller aperture, which is oddly enough a larger number.

Other options for reducing flash intensity include bouncing the flash off the ceiling or putting a diffuser on the flash. Not only will those make your flash less intense but you'll also get a softer and more flattering light.

michael mckee
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05-06-2010, 02:20 AM - 1 Like   #17
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QuoteOriginally posted by mysticcowboy Quote
Several people have mentioned guide number but haven't explained it. At a given flash power, the guide number comes from a chart that gives distances and apertures. The wider the aperture the farther the flash distance. On many flash units that chart is printed on the back of the flash.

With a manual lens you don't set the aperture in the camera as you would with an auto lens. There's a ring on the lens itself that you adjust. If you are getting too strong a flash try a smaller aperture, which is oddly enough a larger number.

Other options for reducing flash intensity include bouncing the flash off the ceiling or putting a diffuser on the flash. Not only will those make your flash less intense but you'll also get a softer and more flattering light.

michael mckee
My Port Townsend A City in Photographs 365
The guide number is a way to rate flahs power.

It is essentually the distance in either feet or meters the flash can expose a frame properly for ISO 100 film at F1.0

You have to make corrections and calculations to get from the flash GN to your situation, google flash photography or get any good book, and you will see all the calculations. It is not that hard.
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