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Canon EOS 40D | Digital Camera Review | Storage and Energy
Canon remain true to the BP-511 battery for the middle segment. An old acquaintance, that keeps surprising as far as stamina is concerned. It is very smart of Canon to standardize as much as possible. If you want to move up one level to the latest model you don’t have to purchase an expensive new battery to go with it. And just like is the case for all EOS models, pictures are stored on a CompactFlash memory card. All of which is very familiar to us.
Canon EOS 40D | Digital Camera Canon EOS 40D | Digital Camera
Canon EOS 40D - CompactFlash memory card
The Canon 40D delivers considerably large files especially in RAW. This is not entirely because of the ten Megapixels but also because of the 14 bits. A RAW file generates a 12.4MB file size. That asks for large storage cards. Even more so if you want to shoot in JPEG and RAW at the same time. If you need the captured pictures only for the Web, you can decide to use sRAW. The file size will then be some 7.1MB. In practice it comes down to the fact that you need at least a 2GB card, when you work in RAW. If you are reporting and sent out on an assignment, you will have to get a 4 or 8GB memory card. And a holiday will require several cards unless you empty the one on your laptop or image tank. The table below shows how many pictures fit on a 1GB CF memory card.

Considering 1GB storage capacity:
RAW - 3888x2592 pixels - 76 pictures
sRAW - 1936x1288 pixels - 135 pictures
RAW + JPEG Large Fine - 3888x2592 pixels - 59 pictures
RAW + JPEG Large Normal - 3888x2592 pixels - 66 pictures
RAW + JPEG Medium Fine - 65 pictures
RAW + JPEG Medium Normal - 70 pictures
RAW + JPEG Small Fine - 69 pictures
RAW + JPEG Small Normal -72 pictures
sRAW + JPEG Large Fine - 90 pictures
sRAW + JPEG Large Normal - 107 pictures
sRAW + JPEG Medium Fine - 103 pictures
sRAW + JPEG Medium Normal - 116 pictures
sRAW + JPEG Small Fine - 1936x1288 pixels - 115 pictures
sRAW + JPEG Small Normal - 1936x1288 pixels - 124 pictures
JPEG Large Fine - 3888x2592 pixels - 274 pictures
JPEG Large Normal - 3888x2592 pixels - 523 pictures
JPEG Medium Fine - 2816x1880 pixels - 454 pictures
JPEG Medium Normal - 2816x1880 pixels - 854 pictures
JPEG Small Fine - 19361288 pixels - 779 pictures
JPEG Small Normal - 1936x1288 pixels - 1451 pictures
Canon EOS 40D - Considerable buffer
The pictures don't have to be written onto the card immediately for the Canon EOS 40D possesses a considerable buffer. As long as you don't shoot full speed 20 RAW images or 205 JPEGs will fit in the buffer in highest quality. That is fabulous for a camera in this class. When using the highest image speed the number will drop a little but it remains excellent.

Canon 40D - 6,5 frames per second
The Canon EOS 40D is capable of capturing 6.5 frames per second at the maximum according to the specifications. Well, this depends very much on shutter speed and other parameters. In practice I was unable to reach this speed, it would stay in between 6 and 6.5 fps which is still an amazing achievement and 9 out of 10 times it is too fast. So don't put too much thought into it.

Canon 40D - USB 2.0 Hi-Speed connection
One advantage of a faster memory card is the faster speed of data transfer providing the computer and the device reading the card are equipped with a fast USB 2.0 Hi-Speed connection. If they are not available, you might want to look for a card reader. This is a handy device that needs to be connected to a USB port and is capable of reading a card and writing to it rapidly. The device will be recognized by the computer as an external hard drive. Additionally you will save energy this way.

Canon EOS 40D - Lithium Ion battery
The Lithium-Ion battery lasts for a long time, this counts for production years as well as the amount of pictures that can be taken with one battery load. Canon claim some 800-1000 pictures can be taken in room temperature. I did not reach that amount but the temperature during testing in the Netherlands was definitely below room temperature and I was working with Live View a lot, an energy consuming function. Despite I find this a fine achievement I would purchase a second battery to be on the safe side.
Canon EOS 40D Canon EOS 40D
   
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