Does gray card a necessary tool in photography? Do you have any gray card with you? I do. I have Mennon Gray Cards. However, I did not use it much since I bought it. 
Mennon Gray Cards
Does gray card a necessary tool in photography? Do you have any gray card with you? I do. I have Mennon Gray Cards. However, I did not use it much since I bought it.
Mennon Gray Cards
