Calculations | Photography Toolbox

Calculation methods used in photography-toolbox

This site documents the methods used to calculate results in photography-toolbox.

Exposure

E V = \log_{2} \frac{f s t o p^{2}}{t} - \log_{2} \frac{I S O}{100}

where

t

is the shutter speed

G N = d i s t a n c e * f s t o p * \sqrt{\frac{100}{I S O}}

Currently (as of v0.2.2), the Circle of Confusion is calculated as

d / 1500

, where

d

is the diagonal of the selected sensor. This may change in later versions! There might be the option to choose your calculation method later as well.

d_{h y p e r f o c a l} = \frac{f^{2}}{f s t o p * C o C}

n e a r = \frac{d_{h y p e r f o c a l} * d i s t a n c e}{d_{h y p e r f o c a l} + (d i s t a n c e - f)}

f a r = \frac{d_{h y p e r f o c a l} * d i s t a n c e}{d_{h y p e r f o c a l} - (d i s t a n c e - f)}

d o f = f a r - n e a r