Confused about flashes Guide Numbers

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Art Mustel Junior Member • Posts: 32
Confused about flashes Guide Numbers

Hello, I am trying to purchase an external flash for my camera and I am a bit confused about the Guide Numbers I read on the ads. For instance, one of the flashes I'm looking at states that it  is Guide No. 138 (105mm). Since that won't tell me much I would like to ask what kind of strength this flash has, is it considered low, normal or high. It is a TTL flash. Thank you in advance.

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