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Simple and it works
I've used the Luxi and it gave me a way to always make sure I had a light meter. The clip is small and my phone is always with me. App is easy to use.
Turn Your Smartphone Into An Incident Light Meter
Luxi For All is a small attachment for iOS devices which works with a FREE app to turn your device into an incident light meter. When paired with the FREE Luxi app, Luxi For All will help you determine the best settings for your DSLR or other camera, so you can take perfectly exposed pictures.
What Is Luxi For All?
Luxi For All is a diffusion dome attachment for your iOS device's front-facing camera. When paired with the free Luxi app, Luxi For All will help you determine the best settings for your DSLR or other camera, so you can take perfectly exposed pictures. It's just like one of those fancy old-school light meters, but at a far better price. And because it works with the gadget you already have in your pocket, it's way more convenient!
Why Do I Need It?
"I already have a light meter built into my camera; why do I need a separate device?"
The light meter built into cameras measures reflected light. A reflected light meter shows an appropriate setting for an average of the whole scene. If you are taking a picture of a scene that does has neither an average, nor internally consistent lighting situation, your camera's built-in light meter will not be accurate. Usually, that causes an overexposed or underexposed picture.
Sunset portraits and other pictures with strong back-lighting are common situations and can be aided by using an incident light meter like Luxi For All.
Will It Work With My Device?
Luxi For All builds upon the design of the original Luxi to bring convenient, inexpensive light metering to everybody who owns a mobile device. While the original Luxi was designed specifically for iPhone, Luxi For All will fit onto almost any of your iOS devices: iPhone, iPod Touch, iPad...you name it. Even if your device is inside a case!