I have a Canon 30D and I currently use a Lastolite EZY Balance Grey/White 12" and I hope there is an easier way?
www.lastolite.com
The problem I have is that I have to take a photo in manual mode and the card must fill the whole frame and I can set my balance from there. It is ok if I have an extra person to hold it but yesterday at a football game it was blowing away in the wind and I couldn't get it in the same light as the players in the field because of shadows and such.
It took about 30 min to secure it and get a shot in the correct lighting.
Please help!