Although the built-in light metering of cameras in the digital era is good, the external light metering meter still has value, and is a great weapon for film lovers. It is not a new thing to use smart phones as light meters, but Lumu, a combination of hardware and software, is a good choice.

The hardware part of Lumu is a light measuring ball. It uses the headphone jack to exchange data with the mobile phone, feel the illumination of ambient light, and then calculate and display the light measuring results through brand A on the mobile phone

Lumi's metering range is - 4 to 20EV, which is larger than that of ordinary professional light meters, and the accuracy is+/-0.1EV

Now Lumu is in the process of fundraising. Users who donate $79 will get a $149 Lumu package, which is still a global package

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