I've been using the Lumu light meter for iPhone since it was first released. Using the dongle along with the Lumu Photo app, I could employ my smartphone for incident light measurements.

Now, with version 2.0, photographers can take reflective readings too - no dongle required. Lumu Photo uses the iPhone's camera for reading the light. So all you have to do is download the app, fire it up, and start taking meter readings. And if you need spot readings, just tap on the screen in the area that you want to measure.

Lumu Photo can be a lifesaver for analog film shooters with non-metering cameras. But this app is also handy for evaluating scenes, double-checking your camera's light meter, and of course, taking incident measurements if you have the Lumu dongle (which happens to be on sale at the moment).

I tested the performance of the reflective meter with an iPhone 5S, and the readouts were very accurate, producing excellent exposures. The app also includes the ability to save meter readings, along with location data, and your notes via iCloud, then synced across devices. Again, great for scouting missions for both photo and video projects.

Speaking of which, Luma also makes a Video and Pinhole app.

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