iOS Light Meter
Light meters are not cheap. A good combo incident/spot meter usually runs upwards of $600. With a few recent developments, you can now use your iPhone as a fully functional incident/spot meter.
Cine Meter by Adam Wilt is available in the App Store for $4.99. It provides an independent spot meter and relative wave form and false color readings. Above you can see a test I ran with Cine Meter. I did a reflective reading with Cine Meter set to ISO 50 at 1/50th of a second. I also ran an incident reading with my Minolta Auto Meter III set to ISO 50 at 1/50th of a second. The readings were within 1/3rd of a stop. Thankfully Cine Meter has built in meter compensation, allowing for precision between your meters.
With Cine Meter, your phone can give accurate reflective readings. Yet, wouldn’t it be nice if you could get both reflective and incident readings from your iOS device?
Lumu is an incident meter attachment in development for the iPhone. Lumu plugs into the headphone jack of your iPhone or iPod. With its companion app, you can quickly an easily get accurate incident light meter readings. Lumu will run a Kickstarter campaign soon. Each Lumu will cost $99. You can learn more about Lumu by following them on Twitter: @Lumu.
Between Lumu and Cine Meter, you can convert your iOS device into a full Spot/Incident meter for just under $105. Used properly, your iPhone can set you free from using a monitor to light your scene.