Light Meter Apps
How to Use the Light Meter Apps
Getting the proper exposure is a three variable equation. In photography, that equation is called the Exposure Triangle. The variables in the exposure triangle are shutter speed, aperture (f/stop), and ISO (film speed). The exposure triangle works exactly the same way for film or digital photography. Installing and using the light meter will help you properly expose your pictures and will also help you learn the exposure triangle. Once you learn the exposure triangle, you can shoot film or digital in virtually any lighting condition.
iPhone App 1
This iPhone app illustrates the exposure triangle really well. To use the app and take a picture, complete the following steps:
Android App and iPhone App 2
This app has a vintage feel that I really like and operates like many old school meters. To use this app and take a picture, complete the following steps:
- Set your ISO to 400 by using your thumb to rotate the inner white circle until 400 in the ISO window. Remember, our film speed is 400. One difference between film and digital is that in digital photography, you can change your ISO from one picture to the next. You can not do that with film. However, in film and digital, the lower the ISO the smaller the grain (in film) or the less noise (in digital).
- Click the "Measure" button.
- Find your shutter speed in the brown circle. Check your camera's shutter speed on the shutter speed dial.
- Find the f/stop on the meter that is directly across from your camera's shutter speed setting.
- Use the focus ring to make sure your subject is clear and then gently press the shutter release button to take your picture.
If your are shooting film and your light meter battery dies or your light meter doesn't work, download one of the apps at the top of this page.