I've used my ExpoDisc with several Canon bodies and with my M8. I have been using it with the D300, too. Tonight I encountered a problem. I was just shooting some test shots inside with incandescent light. I used the Expodisc to set a WB and all the shots that I took had a yellow cast. I re-shot the WB frame a few times. I tried it with Manual and Auto exposure (making sure that my exposure was correct) and the D300 flashed "Good" each time. I made sure the correct WB preset was being chosen (d0). (I use the neutral Expodisc).
I then put WB on incandescent and the shots no longer had a yellow cast.
Can anyone offer any insight as to what is going on here?
Any help would be appreciated.