The apps displays the current EV and integrates a chronometer to help you calculate a perfect exposure. With this app you can input your actual aperture, shutter speed and ISO of your DSLR camera, and it will display some options with different combinations of the previous parameters, but with the same exposure metering. It can be used in exposure meter mode (light meter). The exposure value (EV) is shown at the top of the screen. Your required exposure time will be shown in the display. The slowest shutter speed setting on most cameras is 30 seconds. For any exposure times longer than this, where you need to use the Bulb or Time mode, a countdown timer is enabled so you can time your exposure within the app.
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