Pocket Light Meter
Pocket Light Meter is an iPhone application that allows you to use phone camera as a light meter.
It was the first application that brought live view light metering to iOS devices back in 2010.
Current version brings a range of new features:
- The old interface is now available optionally from the settings
- Better low light performance
- Completely redeveloped settings view
- Switching of aperture, ISO and shutter speed scales on the fly
This version, controversially, disables conversion of the exposure value to approximation of illuminance in lux (lx) and Candle*feet. This is done because previous estimates weren't good enough. Lux and candle*feet are measures of illuminance (how much light is falling on the object) and a camera cannot measure that. Any and every camera in the world captures light reflected from objects, not the light falling on objects.
We had to remove those measurements, because people were using them incorrectly and were relying on wrong measurements when making judgements for emergency lighting installations and other stuff that we don't want to be held responsible for.