Answer:
EI = 7
Step-by-step explanation:
The exposure index formula given is:
[tex]EI=log_{2}(\frac{f^2}{t})[/tex]
Where
f is the f-stop setting
t is the exposure time in seconds
Given, the
f-stop setting = 16
t = 2 seconds
We substitute and use log calculator to find our EI, exposure index:
[tex]EI=log_{2}(\frac{f^2}{t})\\EI=log_{2}(\frac{(16)^2}{2})\\EI=log_{2}(\frac{256}{2})\\EI=log_{2}(128)\\EI=7[/tex]
