F-Stop in shake

Can someone explain how to achieve an f-stop in shake?

from what i understand f-stop has some relationship to the exposure in a camera.

but i think when asked as a compositor to make the scene 1 f-stop higher. i assume they mean more by brightning up the scene, which is done when you increase the exposure in a camera.

so my question is how can one mimic, or is there a value that represents an f-stop in shake?

so far we did a test in nuke which has an f-stop function, and the results can be presented in shake by adding a brightness node and increasing the value by 1.3. (linear)

can this be correct? or is there a more accurate way to recreate an f-stop?

thanks in advance for any help ^_^

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