There is always confusion about the relationship between Guide Number and Watt Seconds (joules) when talking about flash. In this Quick Tips video, I try to provide some education on the differences and why you might use this information when making a flash purchase. The attached video (which is only viewable via thephotovideoguy.ca site) takes you through what you need to know.
Did this video clarify things for you? Let me know in the comments please. Also feel free to pose questions either in the comments or via email to firstname.lastname@example.org and I will answer, either directly, or in the form of an article, podcast episode or video.
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Thanks for reading, listening and watching and until next time, peace