What technique should I be using to set a custom white balance i.e. white card, grey card, white balance lens cap etc or does it depend on the situation?
Answer
Buy a white-balance card. Make sure you place it in the same light as your primary subject.
I use a plastic card which is white on one side and grey (for 18% metering) on the other. I bought it at a local photo store but I don't remember the brand and there's no markings on it, it simply fit the description of what I was looking for.
Our eye is terrible at discerning neutral colors in the scene, which is pretty much why we need white-balance in the first place. We don't see the true colors because our brains compensate and then we complain when the camera does not show us what we saw! So white-balance was invented. (OK, over-simplified but you don't want to read the full explanation do you? ;)
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