LightMeter Pro

This app utilizes your smartphone's light sensor to measure the surrounding brightness and provides the optimal shutter speed based on your ISO and aperture settings.

Whether you're shooting with a film camera, taking long exposure photos, or capturing nightscapes, you can quickly check the settings you need and reduce shooting failures. Experience perfect exposure without the need for a separate light meter!

Download now and start your creative photography journey.

* Key Features of the Shutter Speed Calculator

1) Provides optimal shutter speed even with a narrow aperture under abundant natural light.

2) Prevents underexposure by adjusting ISO and shutter speed during indoor low-light shooting.

3) Easily calculates long shutter speeds according to the light intensity when photographing the night sky.

4) Intuitive UI designed for both professionals and photography beginners.

5) Reduces unnecessary shooting tests for a better photography experience.

6) Provides compatible exposure settings for cameras and smartphone photo apps.

[Required Permission]

Camera Permission: Needed to obtain the illumination (brightness) value.

* Shutter Speed Calculation Method

T = 1 / (Lux * N²) * (ISO / 100)

T (Shutter Speed): The time the camera shutter stays open (in seconds).

N (Aperture Value): The size of the lens aperture (f-value).

Lux (Illuminance): The amount of light (unit: Lux).

ISO: Sensor sensitivity (default: ISO 100 standard).

* The ISO value is applied as a ratio relative to ISO 100.

* Lux (L) represents the brightness, and the aperture (N) is squared to reflect the amount of light entering.