Finding the guide number of a strobe


show more Finding the guide number of a strobe provides you with in-depth training on Photography. Taught by Brent Winebrenner as part of the Lighting for Photographers: Flash Exposure Fundamentals show less
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Finding the guide number of a strobe

In this movie we're going to begin the hands-on process of exploring how to really master your flash. To do that, we'll start by explaining how you can find your flash's guide number and what to do with it once you have it. Small strobe manufacturers use the term guide number to rate the power of their pocket strobes. A guide number is a numerical expression of the ability of the flash to create at a normal exposure at any given ISO. When you leaf through your manual, you should find the table that looks something like this.

Because a higher guide number means more power and more power means a higher value, manufacturers tend to inflate their published guide numbers. This means that if you're serious about getting consistently good manual flash exposures, you should perform your own guide number test. Another reason to perform your own guide number test is because a guide number is dependent upon the accuracy of the ISO rating of the camera sensor. Same flash unit when placed on two...

Finding the guide number of a strobe
Video duration: 4m 52s 1h 27m Advanced

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Finding the guide number of a strobe provides you with in-depth training on Photography. Taught by Brent Winebrenner as part of the Lighting for Photographers: Flash Exposure Fundamentals

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Photography
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