The Old - Light Meter Tools - Free app is an application for calculating the amount of light that reaches the camera and the amount that reaches the eye. The app allows you to use either the camera or the phone's light sensor to get the most accurate result.

The application can be used for any kind of camera, including pinhole, SLR, and digital. It can also be used for any kind of lens, including fixed and variable.

The application includes a depth of field calculator, which can be used to calculate the amount of focus and the depth of field.