Smartphones are now such commonplace devices that it's easy to forget what miraculously clever things they are. The things we used to quaintly call "telephones" are now festooned with sensors, cameras and extremely high resolution displays, and are more than a match for lower-powered laptops, and they have inbuilt connectivity that would make GCHQ (that's the headquarters for the UK Government's Signal Intelligence unit) envious.
So it's really gratifying to see all that power being put to very good use in a professional application for photographers and video makers.
Designed by Adam Wilt, a seminal figure in digital video, Cine Meter for iPhone is a digital toolbox for setting up and using all kinds of lighting.
Using the i-device's camera, it works as a shutter-priority reflected light meter, an RGB waveform monitor and also has a false-colour picture mode.
More than just a one-dimensional light meter, Cine Meter will show you how well your greenscreen is lit, highlighting high-contrast hotspots and shadows.
Cine Meter is completely self contained and doesn't use WiFi or mobile data.
It's available from the Apple Appstore for $4.99