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Large Format Focal Length

Lenses - Focal Length and Coverage:

All camera lenses for all formats have a focal length - 
It is the measurement of the distance from the lens to the film when focused at infinity in millimeters or inches.

Convergance

Measure your magnifying glass focal length by focusing a distant light source on any surface. This is called convergance.
Measuring that distance equals the focal length.

Lens Focal Length - _____________________mm ______________________ inches

f/stops

The f/stop is the focal length divided by the diameter of the lens (or lens opening).
Example 1 - if your lens focal length is 100mm and your lens diameter is 25mm... your f/stop is f/4
Ezample 2 - if your focal length is 10 inches and your lens diameter is 2 inches your f/stop is f/5

The format is determined by the size of the film (width and length)

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