Same cards, Diff Bodies..

Ive got a 40D and, what i hope is a good working 1DmkII comin..

i have 3 cards but i doubt ill always take both bodies everywhere i go, so the question is...

What problems will i encounter when taking a cf card from the 40D to the 1D if any? image count issues?

or should I invest in new cards.. these are ultra2 and extreme3 cards

I don't think there are many issues. I would personally reformat them in the camera you plan to use them, but other than that, you should be fine.

themadman wrote in post #11408481
I would personally reformat them in the camera you plan to use them

Yup, and you should see no difference this way than if you used dedicated cards for each body. I routinely switch cards between my 5d/7d without issue...but I always format them when inserted into either camera.