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Canon PowerShot A640 | Digital Camera Review | Storage and Energy
Canon supplies a 32MB flash memory card with the Canon PowerShot A640. Maybe you think that as the happy owner, you can get to work immediately with the camera, but you should consider buying a memory card with a larger storage capacity. Files can grow to a considerable size, especially with ten Megapixels resolution. If you take a JPEG picture in the highest resolution with the lowest compression, you'll be left with a file of approximately 4MB. A few quick calculations and you will see that you'll only be able to take a hand full of pictures with the memory supplied with the camera. Assuming approximately 3 film rolls or 108 pictures, you need a 512MB memory card at the very least, but personally, I would rather have 1GB.
Canon PowerShot A640 | Digital Camera Canon PowerShot A640 | Digital Camera
Canon PowerShot A640 - 4GB SDHC card
During the testing period, I used a 4GB SDHC card and an Ultra II Plus SD card, both from SanDisk, to save pictures. Whether you choose the SDHC or the standard Secure Digital format has no effect on the Canon PowerShot A640 camera's performance. Both cards are quick enough to be able to handle ten Megapixels. The advantage of using an Ultra II Plus card is that you can stick the card directly in a free USB interface. When you remove the card from the camera, you can snap it in two and work directly via a notebook or pc. It's handy and removes the need for all sorts of annoying cables or using energy from the camera.

Memory Chart - Considering 2GB storage capacity:
Resolution 3648 x 2736 - Super fine - JPEG - 464 pictures - 4100KB
Resolution 3648 x 2736 - Normal - JPEG - 776 pictures - 2460KB
Resolution 3648 x 2736 - Standard - JPEG - 1608 pictures - 1170KB
Resolution 3648 x 2048 - Super fine - JPEG - 628 pictures - 3040KB
Resolution 3648 x 2048 - Normal - JPEG - 1028 pictures - 1847KB
Resolution 3648 x 2048 - Standard - JPEG - 2156 pictures - 874KB
Resolution 2816 x 2112 - Super fine - JPEG - 704 pictures - 2720KB
Resolution 2816 x 2112 - Normal - JPEG - 1168 pictures - 1620KB
Resolution 2816 x 2112 - Standard - JPEG - 2412 pictures - 780KB
Resolution 2272 x 1704 - Super fine - JPEG - 948 pictures - 2002KB
Resolution 2272 x 1704 - Normal - JPEG - 1700 pictures - 1116KB
Resolution 2272 x 1704 - Standard - JPEG - 3356 pictures - 556KB
Resolution 1600 x 1200 - Super fine - JPEG - 1881 pictures - 1002KB
Resolution 1600 x 1200 - Normal - JPEG - 3356 pictures - 558KB
Resolution 1600 x 1200 - Standard - JPEG - 6360 pictures - 278KB
Resolution 640 x 480 - Super fine - JPEG - 7108 pictures - 249KB
Resolution 640 x 480 - Normal - JPEG - 10988 pictures - 150KB
Resolution 640 x 480 - Standard - JPEG - 17268 pictures - 84KB

Canon PowerShot A640 Video Mode
Video resolution 1024 x 768 - 15 fps - 15 min 48 sec
Video resolution 640 x 480 - 30 fps - 15 min 48 sec
Video resolution 640 x 480 - 15 fps - 30 min
Video resolution 320 x 240 - 30 fps - 41 min 46 sec
Video resolution 320 x 240 - 15 fps - 72 min 52 sec
Video resolution 160 x 120 - 15 fps - 201 min 21 sec
Canon PowerShot A640 - Secure Digital card
The Canon A640 camera has a card slot which can take a Secure Digital card. This format of card has become the standard flash memory card for a digital compact camera and even the latest digital SLR cameras from Nikon and Pentax support this little card. What's new is the support from the Secure Digital High Capacity (SDHC) card. This new platform clears the way for SD memory cards with a storage capacity of 4GB and larger. If you combine the Canon PowerShot A640 with a SDHC 4GB card, there is enough space to save approximately 460 pictures in the highest quality. The Secure Digital format has a maximum capacity of 2GB; SDHC can grow to 32GB!

Canon PowerShot A640 - Energy
In general, I approve of using AA batteries instead of Lithium Ion batteries. Lithium Ion batteries are usually expensive and account for a large proportion of the price of the camera. Replacing or expanding them is also not a pleasant experience. Using AA batteries may make the camera thicker and heavier, but this doesn't mean a worse performance. The integration of the DIGIC II processor enables the camera to use less energy. According to the CIPA Standard, four AA alkaline batteries will provide approximately 280 pictures, while fully charged NiMH batteries with a capacity of approximately 2500mAh are good for about twice that amount, i.e. 500 pictures. Another advantage of AA batteries is that you can buy them practically anywhere in the world.
Canon PowerShot A640 Canon PowerShot A640
   
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