If I use my flashgun on Manual, what is the method of deciding which level to use? (ie, 1/1, 1/2, 1/4, 1/8 etc...) or is it just a case of do test shots first, then trial and error?
Looks like the suck-it-and-see method then. May add a light meter to the Christmas list, any recommendations that won't have the missus saying "I'M NOT BUYING YOU THAT!" ?
Looks like the suck-it-and-see method then. May add a light meter to the Christmas list, any recommendations that won't have the missus saying "I'M NOT BUYING YOU THAT!" ?
for example if the subject is 15ft away you would do 58/15 = 3.87 ~ f/4
this is a very simplified version, as you have to take into account the film speed and the GN changes as you reduce the power of the flash - 1/2 power would not just be 58/2 though.
your best bet is to just google 'guide number equations' as I'm sure there will be a better more comprehensive explanation out there. I used to use them all the time, but have gotten lazy since I bought my meter (sekonic L358) about a year ago.
I've got a L-358 as my light meter. Very very good buy that was!!! Get one of those
As for manual power of your flashes I just do it depending on what the natural lighting is like and if your wanting a more natural flash look to match the ambient or if your wanting to just have the light from the flashes.
Bright sunny days - 1/1 or 1/2
Overcast - 1/2 or 1/4 (depending on the effect and lighting I'm going for)
Night - 1/2 or 1/4
Then change the light spread as well, so if you want a more direct light on your subject or a wide light spread.
Well thats what I do in my skateboarding shots anyway. It's just a matter of trying and seeing really
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