Finally, in the preview window, please tap where you want to measure the exposure. note: If you do not know the F-number of your pinhole camera, please calculate focal length / pinhole diameter. If you want to use photographic paper, please set to ISO6. Please note that in a dark place, you may not be measured accurate exposure. [Using the Countdown timer] 1. To start the countdown, tap the timer icon to the right of the exposure time. 2. Preview screen will be dark, and exposure time is displayed in white letters. It will decrease one second at a time. *To stop the timer, tap the Close(X) icon. caution: During the countdown, do not close this app, or do not navigate to another screen. Timer is stopped.
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