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The YN560-IV is powerful with a guide number of 190' at ISO 100 and 105mm. The unit is also quite versatile with a zoom range of 24-105mm, which is able to be expanded to 18mm with the built-in wide-angle diffuser. Additionally, this output can be adjusted from 1/1 to 1/128 power in 1/3 and 1/2 EV steps. 1 Dec 2016 Conclusion: The guide number published by Yongnuo is accurate. There are many reports on the Internet to the contrary so I wanted to test this Can anyone tell me the guide numbers for the various Yangnou flashs? The Yongnuo YN-560 II has a GN of 58 metres, for example. Brian A. The guide number (GN) of an electronic flash is a measure of the maximum light output – visit the test details page to learn Flash head manual motor zoom: You can adjust the zoom range by setting [+] .. GN58 @ ISO100, 105mm: YONGNUO gives YN560 a higher guide number The YN560-III is powerful with a guide number of 190' at ISO 100 and 105mm. Since I am shooting off camera, I also purchased the YN560-TX manual flash When setting photoflash exposures, the guide number (GN) of .. HVL-F58AM, Yongnuo YN-568EX, Canon Yongnuo YN600EX-RT-II flash review. As a professional high guide number flash, 29 Nov 2010 Here's now my comparison of Yongnuo guide number specs vs guide number . I set the flash under review always to 100, and then the other19 Sep 2018 We've created this Yongnuo comparison guide to help you figure out The YN660 models have a higher guide number rating of GN60 and are