Martin Lisius has a white balancing tip for you that involves using a simple iPhone app.
In this video, I show you a quick, easy, and inexpensive way to take a color temperature reading off an 18% gray card using an iPhone app called ProCam ($4.99). You should be able to do this with a white card as well, but I use a gray card for both white balance and exposure. This is especially useful for those shooting with a camera like the Sony PXW-FS7 in Cine EI mode which doesn’t currently offer custom white balance. I just happened to stumble upon this one day when using ProCam to shoot stills with my iPhone.
ProCam for iPhone (https://itunes.apple.com/us/app/procam-4-manual-camera-+-raw/id730712409?mt=8)
iPhone 6s (amzn.to/2iaPqI2)
Novoflex Controlcard (amzn.to/2iaAcD4)
Sony PXW-FS7 (amzn.to/2ghdw3g)
Canon 24-105mm f/4.0 L (amzn.to/2gGqHKF)
Metabones Speedbooster Ultra for Canon EF to Sony E (amzn.to/2gGhtOc)
Sony a6300 (amzn.to/2gkUfNk)
Sony 16-50mm f/3.5-5.6 OSS Zoom Lens (amzn.to/2fLIueA)
Martin Lisius is a producer, director and cinematographer at Prairie Pictures, Inc. (www.prairiepictures.com). He is the founder of StormStock, a collection of weather and climate footage he founded in 1993 (www.stormstock.com). Full bio at https://www.linkedin.com/in/martinlisius