Hello I have been doing some searching on youtube and google for how to use a grey card, what it's used for, etc. I have seen videos and read that some use the card to adjust white balance for when they are shooting and others have the card in a picture and use it for post production. Is there a big difference in either or is it just preference from photographer?
Would like to receive any recommendations where I can purchase one? I have gone to bh/adorama but there are a few cards listed on either site. As I am not sure which one is descent to do the job, can anyone suggest one? Not trying to buy a costly one either. Thank you in advance for your help.