This is a calculator that will help you in finding the focal length of a photographic lens. The method is about focusing on one or more objects at different distances. Each time, you write down 3 measurements. Only one measurement could do. But the idea is that “averaging”...

# toolbox

Some simple and useful alculators and simulators for photographers

## Angle of View for a photographic lens based on image circle and focal length

Result is presented in degrees.

## Front raise and horizon line

For a given lens and given film or sensor format, this simulator shows how much it is possible a front raise and where the horizon line will end up in the final picture. Focusing is assumed to be at, or closer to infinity, a normal landscape condition. Observations: 1 – The scheme is...

## Image circle from angle of view and focal length

Evaluates image circle diameter for a given angle of view and focal length. Result is presented with the same unit you used for focal length.

## Minimum image circle for a given film format

Use this calculator to find out what is the minimum image circle your lens must provide in order to cover a certain film format.

## Lens/subject/format – an online simulator

How it works: You enter the focal length of your lens, film or digital sensor dimensions and the approximate size of your subject. The simulator shows in value and graphically the following corresponding information: the distance you must place your lens from the subject the image circle and angle...