03-09-2012, 06:00 PM
I now use 1 x 32 GB SanDisk Extreme (not the Pro) and 2 x 32 GB Transcend 400x with 7D. Best balance (for me) between price and performance for the latter at the time I purchased them.
16 GB? Calculate each RAW with about 30 MByte and you run into trouble on dance shows. In video: About 50 Minutes (4 x 12-13 min)in highest resolution.
600x makes a difference shooting sequences at 8 fps for more than 17 frames in RAW. About 17 frames fit into the camera buffer, after that there is some kind of "2-shots, short pause, 2-shots" sequence in process, no matter how fast your card is. The faster the card the shorter the pause and the shorter the "buffer empty lag" to wait before the next 17-shot-sequence in full speed will be ready.
The faster the card is the shorter *may* be the time to read images into the computer. If you're using the USB-2.0-transfer directly from the camera you will have about 16 MByte/s. A good USB 2.0 card reader will do about 33 MByte/s when reading. A really fast card reader (USB 3.0, ExpressCard) will give you whatever the card is able to deliver. I tested my USB 3.0 card reader with an big ISO file and was able to read with more than 65 MByte/s. Surprise: The Transcends are a very little bit faster than my SanDisk in this scenario.
If you are interested in what the fastest card are able to do, visit Rob Galbraith:
http://robgalbraith.com/bins/content_page.asp?cid=7-10043-10255
http://robgalbraith.com/bins/content_page.asp?cid=7-10044-10297
http://robgalbraith.com/bins/content_page.asp?cid=7-11673-12268
And get a second or even third battery for your 7D. This camera is a serious power drain. You will miss the 400D's economic use of battery power, I promise.
Ciao, Walter
16 GB? Calculate each RAW with about 30 MByte and you run into trouble on dance shows. In video: About 50 Minutes (4 x 12-13 min)in highest resolution.
600x makes a difference shooting sequences at 8 fps for more than 17 frames in RAW. About 17 frames fit into the camera buffer, after that there is some kind of "2-shots, short pause, 2-shots" sequence in process, no matter how fast your card is. The faster the card the shorter the pause and the shorter the "buffer empty lag" to wait before the next 17-shot-sequence in full speed will be ready.
The faster the card is the shorter *may* be the time to read images into the computer. If you're using the USB-2.0-transfer directly from the camera you will have about 16 MByte/s. A good USB 2.0 card reader will do about 33 MByte/s when reading. A really fast card reader (USB 3.0, ExpressCard) will give you whatever the card is able to deliver. I tested my USB 3.0 card reader with an big ISO file and was able to read with more than 65 MByte/s. Surprise: The Transcends are a very little bit faster than my SanDisk in this scenario.
If you are interested in what the fastest card are able to do, visit Rob Galbraith:
http://robgalbraith.com/bins/content_page.asp?cid=7-10043-10255
http://robgalbraith.com/bins/content_page.asp?cid=7-10044-10297
http://robgalbraith.com/bins/content_page.asp?cid=7-11673-12268
And get a second or even third battery for your 7D. This camera is a serious power drain. You will miss the 400D's economic use of battery power, I promise.
Ciao, Walter