Thanks. So if I read this correctly, HD 1080 video consumes about 145MB of card space per minute. So, an 8 MB card should yield about an hour (55 min.) of video. Now all I need to do is to figure out the whole speed issue and I'll be set! Thanks again!
Not sure what minimum speed is needed in the camera, but when you transfer to the computer, the 30mbs Sandisk really helps. I use the 32GB version in the second slot and take stills on a 32GB class 10 Patriot card in the first slot. All class 10 cards are not equal, but they do seem fast enough.
Those plus two extra batteries and I am good to shoot either all day long.
At the most recent Church VideoGraphing session, I shot at the highest resolution and quality for 59 minutes. It took less than 8GB and used only 30% of one battery.
I had the still camera (D3S) at stage right and the D7K in the back of the room, sometimes I missed hitting reset running between the two and at times presentations went beyond 20 minutes so edit is in play then regardless.
Mistakes were many but the first time out, to stupid to mention however a lot of content in focus even though.
Shot at 1080p etc.
Lens changes should have been in order as well but as I said first time out, won't happen again.
I think you're going to find the speed of the card is more important in the capture of the image than in the transfer to your computer...1080 is shoving a lot of info into a small processing pipeline and to ensure against dropped frames / mishaps (especially for those of you who are testing the recording time limits) I would stick with Class 10 cards...
I've been using the Class 10 SDHC "Pro" cards from Delkin Devices...they read at 24 mb/s and write at 17 mb/s...equal to a 163x speed. I've always had great luck with their compact flash cards and these are no different...extreme temp rated (-13-158* F) optimized for digital video with a lifetime warranty (not that you'll need it and a much more reasonable price ($54.00 for 16gb at Amazon DDSDPRO3-16GB) than comparable Lexar or SanDisc ($79.00 and up).
btw: just did a quick check and I'm averaging 150mb per minute in 1080/24 with reference audio recording on as well as video.