This is a photographic exposure meter.

You can use the illuminance sensors of smart phones, to know the f-number and shutter speed easily.

Step of the shutter speed is supported on continental series and multiple series.

Measurement results of the exposure meter is dependent on the accuracy of the included light sensor on Your SmartPhone.
If so, you can ajdust Result Value manually.

Tags: light meter , 露出計 アプリ ストロボ , light meter script , light meter script html 5

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