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 ross@thephotovideoguy.ca and I will answer, either directly, or in the form of an article, podcast episode or video.

If you shop with B&H Photo Video, please consider doing so through the link on thephotovideoguy.ca as this helps support my efforts and has no negative impact whatsoever on your shopping experience.  If you find the podcast or articles of value, consider clicking the Donation tab in the sidebar of the website and buy me a coffee.  Your donation goes to help me keep things going.  Email your questions on any photo or video topic and I will try to respond within a day.

Thanks for reading, listening and watching and until next time, peace