Canon 20D: Raising the Bar for Prosumer Digital SLRs
by Stephen Caston on November 11, 2004 12:05 AM EST- Posted in
- Digital Camera
Resolving Fine Lines
For our resolution test, we reset the cameras to their default settings and then captured the chart in both JPEG/Fine and RAW modes. The cameras were set to Aperture priority (f/11). A Canon 50mm Macro lens was used on both cameras. For more information, refer to our Testing Procedures page. The RAW images have been converted to high quality JPEG files using Photoshop. We did not do any post-processing other than adjusting the EV (exposure value) when necessary. The original CRW/2 files are also available for download. Below the downloadable charts are 200% crops of the test. When reading this chart (ISO12233), the numbers represent lines per picture height (LPH). For example, the number 15 would represent 1,500 lph.| 20D | 10D | |
| JPEG/Fine | Download | Download |
| RAW (JPEG) | Download | Download |
| RAW (original) | Download WARNING: 8MB |
Download WARNING: 6MB |
| 20D JPEG (+1.3 EV) |
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| 20D RAW (+1.3 EV) |
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| 10D JPEG (+1.5 EV) |
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| 10D RAW (+2.0 EV) |
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| 20D JPEG (+1.3 EV) |
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| 20D RAW (+1.3 EV) |
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| 10D JPEG (+1.5 EV) |
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| 10D RAW (+2.0 EV) |
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Our resolution chart shows that the 20D is able to resolve fine lines out to 1,800 LPH (lines per picture height) in RAW mode. The image loses detail as the lines become finer, but the chart ends before extinction occurs. In JPEG/Fine mode, the 20D loses a small amount of resolution and produces fine lines out to 1,700 LPH. Again, extinction does not occur because of the limit of the chart.
In RAW mode, the 10D is able to capture fine detail out to 1,600 LPH. Extinction does not quite occur by the end of the chart, but it is close. In JPEG/Fine mode, the 10D can produce distinct lines up to 1,500 LPH. What this test shows is that the 20D is able to capture as much as 2,000 LPH more than the 10D.
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maxusa - Thursday, November 11, 2004 - link
This is a professional DSLR, not prosumer. The only prosumer attribute of the 20D might be price of the body. But even this is highly questionable if one factors in lens(es). I recommend you change this misleading assertion.Mday - Thursday, November 11, 2004 - link
Hmm, I would have liked to see an accessory list:"All" EF lenses
EF-S lenses
flashes
battery grip
Overall, dpreview forums provide much better insite into the camera from users of cameras.
Without a forum attached to digital imaging, questions and comments to anandtech forums are lost to the billions of posts in general hardware.
stephencaston - Thursday, November 11, 2004 - link
Thanks for the comment and good suggestion. We will include this info in future reviews.Gatak - Thursday, November 11, 2004 - link
Nice article =) the D20 is cirtanly on my wishlist.There are things I'd like to see for future photography /image quality tests. You should mention the colour profile and gamma settings for the images that you use.
A uncalibrated CRT monitor (the default Windows and Linux user) will use a gamma close to 2.5 instead of the sRGB of about 2.2. Unless the user has compensated the gamma shift on their system using tools like Adobe Gamma or xgamma these pictures will look much to dark.
I have illustrated the difference on this image: http://moment22.mine.nu/20dcc-gamma-compare.jpg
It should be viewed on a sRGB monitor or in a application that can simulate sRGB on your monitor (like Photoshop)