Why the distance is absent from the exposure triangle?

by user174174   Last Updated January 05, 2018 20:18 PM

Sorry if this is a dumb question. I also didn't find a similar in search. On the exposure calculation, there are fn, shutter speed and iso. Also flash / light meters gives you the fn and speed for a given iso. However light intensity drops drastically with distance. It may not be a problem for ttl metering since it measures amount of reflected light from the subject that reaches the camera but using a flash meter reads the light hitting the subject and gives you a set of fn and ss regardless of where the camera is located. Why is it so? I've seen a lot of photographers that take a measurement from under the chin and then move around, how is this a proper metering?

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