I found a pretty good blog post that goes into what David and Jon were talking about on the last Ed Night about using off camera flash. For those of you that missed the meeting or those that want that written down help that you can refer too..
https://www.kenkoskela.com/blog/how-to-expose-for-flash-and-existing-light-separately-using-your-cameras-controls/
Last Updated on July 10, 2018