But the 5DMII has a nice image. The 70D is the problem...
We also did the adjustments to make the 70D look like the 5D.
However the colour was either too yellow or too blue. What i feel like is that the 5d has a bigger cast of correct white balance (don't even know if that is possible), while the 70D is never (at least from my experience) in the sweet spot.
I'll try the cards trick, anyway.
I haven't tried with the white/grey card. I'll do it!
Both with the same Kelvin number 4600, 5600, etc. According to the situation.