This is where the term F Stop comes from. In camera lenses, the aperture is measured in F Stops. These are measured using a ratio of the focal length divided by the opening size. A smaller F stop ...

What are the f-stops on your camera or lens? And what kind of effect does changing them have? Our chart explains all ...

Choosing the right focal length is a crucial part of the creative decision making process for a photographer. You can have ...