I recently purchased a adapter card for my 7d so i could use some of my many sd cards. I have found that the sd card will work fine in high rate[50-60fps] low resoloution recording but will shut down and stop recording after 2-3 seconds recording in low rate 24-30fps regardless of camera settings. I this to do with needing a cf/udma card or is it due to the sd cards record speed? If speed is the reason, why will it function in the high frame rate and fail in a lower or lowest fps settings. This is just something I am trying to to so that I may be able to use some of my many sd cards. If the recording ability of the high speed sd cards I have is the problem, I guess I will need a collection of cf cards to take along. Im not sure what the recording speed of the sd cards I have are, but they are of highest speeds. From what I have been able to acertain, aleast 133x speed is needed to record smooth video quickly. This is just a little quirk I discovered while experimenting with this adapter and getting my new 7d ready to go to the races. If anyone has a mirror problem or a remedy, please respond! Thanks!