Exposure triangle explanation please.

Started Jul 9, 2013 | Questions thread
Jeff Veteran Member • Posts: 5,122
Re: It's only an explanatory graphic ...

AnthonyL wrote:

and which part of your explanation did I say I did not understand?

Well, if you're comfortable with this explanation, then the triangle is obvious. Get yourself a piece of triangular graph paper -- label each corner with ISO, f-ratio, and shutter speed, and label each grid line moving away from the corner with a one-stop change in the corresponding value.

For fixed incident light, every point inside the triangle results in the same image brightness.

If the corner for ISO is set to S = 100, and the other corners are labeled t for shutter duration, and N for f-number, then the exposure value (EV100) is given by EV = log2(N^2/t) which will be the same everywhere inside the triangle.

Did that answer your question?

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