marki3rd wrote:
Yes the GN is specified for a reference ISO, you are correct. I didn't mention it becuse when you check the GN for a flash it always states the ISO (as you said, usually ISO 100) as part of the specification. After I posted the thought crossed my mind that possibly I should have mentioned the ISO relationship but didn't bother to go back and elaborate.
I did the same thing regarding feet/meters. There are so many times when we "fill in the blanks", I forget that someone who isn't familiar with this already doesn't know how to fill them in. :-)