An aerial photographic film is optimally exposed with an f-stop setting of f-8.0 and a shutter speed of 1/500 second.
- What is the correct f-stop setting if the shutter speed changed to 1/1000 second?
- f-2
- f-5.6
- f-11
- f-16
- What is the correct f-stop setting if the shutter speed changed to 1/250 second?
- f-2
- f-5.6
- f-11
- f-16
- What is the correct f-stop setting if the shutter speed changed to 1/125 second?
- f-2
- f-5.6
- f-11
- f-16
\[
EV = log_2\frac{N^2}{t}
\]
\[
EV = log_2\frac{8^2}{\frac{1}{500}}
\]
\[
EV = 14.96578428466
\]
\[
EV = log_2\frac{N_1^2}{t_1}
\]
\[
14.96578428466 = log_2\frac{N_1^2}{\frac{1}{1000}}
\]
\[
N_1 = 5.65685424949
\]
\[
N_1 \approx 5.6 \leftarrow \text{answer}
\]
\[
EV = log_2\frac{N_2^2}{t_2}
\]
\[
14.96578428466 = log_2\frac{N_2^2}{\frac{1}{1000}}
\]
\[
N_2 = 11.31370849898
\]
\[
N_2 \approx 11 \leftarrow \text{answer}
\]
\[
EV = log_2\frac{N_3^2}{t_3}
\]
\[
14.96578428466 = log_2\frac{N_3^2}{\frac{1}{125}}
\]
\[
N_3 = 16 \leftarrow \text{answer}
\]
