Timings & File SizesNumerous internal improvements in the development of the EOS 20D make it a noticeably faster camera the EOS 10D. Some more important differences are the sub half-second startup time (EOS 10D was around 2.3 seconds), RAW record review of 1.3 seconds (EOS 10D was around 2.3 seconds), playback browsing speed, much faster CF write speeds and faster continuous shooting rate (with a larger buffer). The sum of these improvements is a camera which feels much more responsive and is pretty much always ready to shoot no matter what you throw at it. Timing Notes: All times calculated as an average of three operations. Unless otherwise stated all timings were made on a Large (3504 x 2336) JPEG image (approx. 2,700 KB per image). Media Notes: The 4 GB SanDisk Ultra II card was formatted at the default FAT32 cluster size (4 KB), formatting with the larger 32 KB cluster size produce only a 3% write speed improvement. SanDisk Ultra II cards have the same performance as the SanDisk Extreme cards sold in North America. The media used for this test were:
Continuous Drive modeTo test continuous mode the camera had the following settings: Manual Focus, Manual Exposure (1/250s, F3.5), ISO 400. We observed that no matter what the image quality setting, ISO or CF card used the initial frame rate was always 5.0 fps (+/- 0.1 fps). The tests carried out below measured the following parameters for both JPEG (Large/Fine) and RAW:
* As soon as the 'Max Burst' display on the viewfinder reaches 9 (JPEG) or 6 (RAW) The media used for these tests were:
Burst of JPEG (Large/Fine) images
Burst of RAW images
The EOS 20D's continuous shooting capability is very impressive, especially when combined with a fast CompactFlash card. The EOS 20D processes RAW buffered data into the output format and places back in the buffer, this queue of images is then written to the CF card. Because of this system the camera releases enough buffer space for another burst before all images have been written to the CF card. In JPEG mode with a decent card you can fire off 25 frames in five seconds and then another 25 just over seven seconds later (and on and on). File Flush TimingTimings shown below are the time taken for the camera to process and "flush" the image out to the storage card. The EOS 20D will begin writing images as soon as it can and continue to write 'in the background' while you take further shots / change settings. You cannot browse other images or enter the camera menu while images are being written to the storage card. The media used for this test were:
What difference a good CompactFlash card can make, with SanDisk's 1 GB Ultra II card the EOS 20D takes just 1.7 seconds to write a RAW file, and around three quarters of a second for a Large JPEG. Indeed this performance is almost as good as the EOS-1D Mark II and more than twice as fast as the EOS 10D. It also is clearly worth investing in a good fast CF card. Card performance: JPEG burst
Card performance: RAW burst
Firewire Reader Benchmark
Battery lifeThe EOS 20D's new BP-511A Lithium-Ion rechargeable battery provides approximately 25% more capacity than the EOS 10D's BP-511. This in combination with a new generation of the DiGiC processor equates to longer life, indeed Canon quotes an impressive 1,000 frames without the flash. Our experience was that in a days shooting it was fairly difficult to run the battery completely flat. Canon supplied battery life data
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