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DPChallenge Forums >> Hardware and Software >> What is a guide number...
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Canon PowerShot S50
 12/03/2003 11:42:11 PM · #1
On dedicated external flashes (I'm going to get one that connects to my camera's hot shoe), what do all those silly numbers mean? What is a "guide number?"

Message edited by author 2003-12-03 23:45:19.
Pentax K10D
Pentax DA 18-55mm f/3.5-5.6 AF
 12/03/2003 11:45:59 PM · #2
Go to "Photo Dictionary" in my signature and type "Guide Number".
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