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Canon EOS-1Ds Mark III Camera review | Storage and Energy
All the pixels the Canon EOS-1Ds Mark III captures have to be stored somewhere. They can be stored on a Secure Digital/SDHC as well as a CompactFlash memory card like the other models. Both formats have their advantages so you can go ahead and use the card of your preference. The camera gets its power from a new battery and Canon chose to use the same one as the one used for the EOS-1D Mark III.
Canon EOS-1Ds Mark III | Digital Camera Canon EOS-1Ds Mark III | Digital Camera
UDMA support
Unlike its faster brother, the Canon EOS-1Ds Mark III does offer UDMA support. It was about time Canon started to support this standard to be blunt. Thanks to UDMA writing pictures to a memory card is carried out a lot faster. And because you're able to insert two cards in the camera, you can decide where to store your pictures. You can shoot until one card runs out of space and automatically move on to the next card. Or you can choose to store on both cards at the same time. Or you can store in RAW on the one card and in JPEG on the other. And you can also copy pictures from one memory card to the other. There are many possibilities to choose from.

Shooting photos in RAW or sRAW format
You need to have sufficient memory at your disposal when using the Canon EOS-1Ds and even more so if you shoot with full resolution in RAW format. If you don't need full resolution but still want to work in RAW, Canon offers sRAW (small RAW). You get a quarter of the resolution so 5.2 Megapixels. For many types of photography this amount will suffice. For instance for capturing reception pictures at a wedding or a portrait for a newspaper. You have the advantage of full-frame and a solid camera. Fortunately Adobe Camera RAW also supports sRAW nowadays. This doesn't mean that Digital Photo Professional, the included Canon program, is bad. Not at all and in my opinion it‘s even unrecognized. Anyway, whatever format you'll work with your memory will fill up fast. The table below shows how many pictures fit on a 2GB card.

Considering a 2GB storage capacity
Resolution RAW - 5616 x 3744 pixels - 25.0MB - 75 pictures
Resolution RAW + L - 25.0 + 6.4MB - 54 pictures
Resolution RAW + M1 - 25.0 + 5.2MB - 57 pictures
Resolution RAW + M2 - 25.0 + 3.9MB - 60 pictures
Resolution RAW + S - 25.0 + 2.2MB - 64 pictures

Resolution sRAW - 2784 x 1856 pixels - 14.5MB - 130 pictures
Resolution sRAW + L - 14.5 + 6.4MB - 82 pictures
Resolution sRAW + M1 - 14.5 + 5.2MB - 90 pictures
Resolution sRAW + M2 - 14.5 + 3.9MB - 97 pictures
Resolution sRAW + S - 14.5 + 2.2MB - 100 pictures

Resolution L - 5616 x 3744 pixels - 6.4MB - 290 pictures
Resolution M1 - 4992 x 3328 pixels - 5.2MB - 350 pictures
Resolution M2 - 4080 x 2720 pixels - 3.9MB - 470 pictures
Resolution S - 2784 x 1856 pixels - 2.2MB - 840 pictures
Canon 1DS Mark III Buffer
I'd recommend purchasing a fast memory card for the Canon-1Ds Mark III and not in the least because the camera supports UDMA. You will really benefit from it. The images are firstly stored in a buffer with a large capacity. Some 16 RAW pictures fit in the buffer. That might not seem a lot, but keep in mind that the pictures take up 25MB of space each. And if you shoot a combination of RAW + JPEG the picture will take up some 35MB, impressive! The Canon EOS-1Ds is not designed for action photography with many sequential shots.


2300mAh Lithium-Ion LP-E4 battery
The Canon EOS-1Ds Mark III uses a new Lithium-Ion LP-E4 battery with a capacity of 2300mAh. It is the same one Nikon use. The battery has a lot of pros. It is compact, light and has a lot of power. The only disadvantage is that you have to use a different battery charger than you use for the Mark II or Mark I. Moreover Canon deliver everything to enable using the camera with the electric mains besides the battery and battery charger. This is quite unique for today's market. One battery load lets you take a heap of pictures. I was able to take over 1500 pictures. The LCD monitor shows the exact percentage of the amount of power left in the battery. It will prevent you from getting unpleasant surprises such as running out of power on an important assignment.
Canon EOS-1Ds Mark III Canon EOS-1Ds Mark III
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