For compatibility with iPhone 6 or 6+, Android, and more, please see Luxi For All
Luxi™ is a diffusion dome that fits securely over your iPhone’s front-facing camera. When attached and used with a light meter app, Luxi™ will help you determine the best settings for your DSLR or other camera so that you can take perfectly exposed pictures.
Dave Johnson, writing for Macworld:
If you don’t have a light meter yet, Luxi gets you get in the game for less than a tenth the cost of a traditional one–and the accuracy is superb, delivering the same kind of results you’d get from a “real” meter.
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LUXI is a Trademark of E S Devices.