I just wanted to get a few perspectives on grey cards. I currently own a cheap Neewer card that has worked fine for my purposes so far, but I've always wondered how accurate it is. Because I intend to test some film stocks soon, I want to find one that I know is perfect.
I've been thinking about getting the Kodak R-27 card, but the price tag of $27 for a piece of cardboard has made me hesitant to do so. I can't help but think that if I'm going to pay money for a reference like this, maybe I should look at other options as well.
Does anyone have any grey card recommendations as well as advice on using one?