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lilac22 said:I'm struggling with determining correct exposures when working with manual flash off camera, especially A---when my flash represents the primary source of light in the scene.
Could someone please work me through it please?
A common problem is if I meter for ambient only my camera will need to be setup way beyond where I am happy, in terms of ISO and speed. So rather than setting a perfect ambient exposure, I get as close as I can without pushing my ISO and shutter speed too much and then I end up chimping with my flash firing to get enough light.
The downsides are in processing I realize my exposure on my subject can be up or down some ways; the LCD lies and it takes time and looks unprofessional.
I have a Portaflash meter for flash, but with no correct ambient exposure to work from don't understand how I can use it to resolve the above issues.
I would really appreciate some help, thank you.
Using the Guide Number (GN) of the flash unit :
GN = distance × f-number
and using some basic algebra:
Distance = f-number / GN
f-number = Distance / GN