The shutter speed, S, of a camera varies inversely as the square of the aperture setting, f. When f=8, S=125. How do you find a formula for S in terms of f?

tragikovas

tragikovas

Answered question

2022-09-05

The shutter speed, S, of a camera varies inversely as the square of the aperture setting, f. When f=8, S=125. How do you find a formula for S in terms of f?

Answer & Explanation

Lily Travis

Lily Travis

Beginner2022-09-06Added 14 answers

We can try using:
S ( f ) = A f 2
where A is a constant that we need to find.
We use the fact that when f=8 then S=125 in the above formula:
125 = A 8 2
rearranging:
A = 125 8 2 = 8000
So our function is:
S ( f ) = 8000 f 2

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