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Sail tension bands: https://amzn.to/3kMzack Bracket for 2 flashes: https://amzn.to/2EGHUl8 Head for 3 flashes like mine (currently unavailable): https://amzn.to/2GfEQg0 Head for 3 flashes (very interesting in my opinion): https://amzn.to/3kLhY78 Head for 4 flashes: https://amzn.to/3jbrTm7 00:00 - Introduction 00:42 - Why put multiple flashes together 03:53 - How to hold multiple flashes together 10:56 - How to calculate the Guide Number of multiple flashes together 16:06 - Comparison of Guide Number and power in Ws 18:13 - Conclusions Follow me on Facebook for the latest news! / stefanotealdiphotography Follow me on Instagram to see my latest photos and daily stories! / stefano.tealdi Subscribe to my newsletter to always be updated on my activities and the courses I hold! http://www.stefanotealdi.com/newsletter Tips for LAMPISTA photographic equipment: http://www.stefanotealdi.com/impara-a... For those who want to thank me for the videos, you can think about making your next purchase on Amazon by going here (nothing changes for you in terms of price, I get a very small percentage): https://amzn.to/2TnYgQX