Even if you plan to alter or grade your footage afterwards, having an accurate and consistent starting point makes your life much easier. Getting perfect white balance without a grey card, Expodisc, ColorChecker or fancy colour meter can be tricky, though. But it’s not impossible.
This video from Blake Rudis at f64 Academy walks us through a simple 3 step process to get perfect white balance in Adobe Camera Raw. While a neutral source in your shot can make this process much faster, this technique is still very quick and easy.