White balance for the Nikon D5100
I am slowly trying to use more manual skills in my amateur photography. I use mostly natural light and I was wondering what the best way to get good white balance. I have looked into both grey cards and possibly getting an Expodisc, but the price difference is quite a lot. Would I really be THAT much happier with the Expodisc, or will a grey card give me a significant difference in making the white balance right?