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Hi, I can't find my manual that came with my speedlite. I went to their website but I coundl't find a download section. Does anyone use/have a pdf or a link to the manual? Somethings I want to try at home regarding lighting Thanks

Hi I ordered a 720nm IR filter and I wanted to calculate how "Dark" the filter is going to be because I want to calculate how long I have to expose for . Sort of like ND filters have a # based system. ND 1 , ND 6 is there a formula for that? Do I have to find out by trial and error? 720nm...