TheGeekery

The Usual Tech Ramblings

Flash, and Something New...

Ever tried to figure out how to get the perfect exposure? Old time photography pros probably already know all about the Guide Number, but Strobist has a quick guide to the “Guide Number”. It’s a handy bit of information, and I had a play with it this evening. You can dial in the f stop you want on the flash, the power level, and the iso, and it’ll tell you how far from the subject the flash should be. For example, on my SB-800, when set to ISO200, and 1/16th power, 50mm zoom, and f8, it says I should put the flash 2m away from the subject. Pretty nifty stuff. He even put up an image of an SB800 dialed in.

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