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Canon EOS 400D / Digital Rebel XTi review Gordon Laing, August 2006

Outdoor / Resolution / Noise / Noise 2

Canon EOS 400D / Rebel XTi vs Canon EOS 350D / Rebel XT real-life noise comparison

Canon EOS 400D / Rebel XTi with 18-55mm lens at 25mm
To compare noise levels under real-life conditions we shot the same scene using the Canon EOS-400D / Rebel XTi and Canon EOS-350D / Rebel XT within a few moments of each other using their best quality JPEG options, and at each ISO setting. Both cameras were fitted with the EF-S 18-55mm f3.5-5.6 kit lens, set to an aperture of f11 in Aperture Priority mode; f11 was necessary due to the high brightness of the scene.

The image left was taken with the Canon EOS 400D / Rebel XTi at 100 ISO using the EF-S 18-55mm f3.5-5.6 lens at 25mm f11 (40mm equivalent); the original JPEG measured 3.8MB. The crops are taken from an area just below and to the left of the centre.

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Canon EOS-400D / Rebel XTi
Using Canon EF-S 18-55mm f3.5-5.6
Canon EOS-350D / Rebel XT
Using Canon EF-S 18-55mm f3.5-5.6
Canon EOS-400D / Rebel XTi noise at 100 ISO
Canon EOS-350D / Rebel XT noise at 100 ISO
100 ISO, 1/125, f11
100 ISO, 1/125, f11
Canon EOS-400D / Rebel XTi noise at 200 ISO
Canon EOS-350D / Rebel XT noise at 200 ISO
200 ISO, 1/250, f11
200 ISO, 1/250, f11
Canon EOS-400D / Rebel XTi noise at 400 ISO
Canon EOS-350D / Rebel XT noise at 400 ISO
400 ISO, 1/500, f11
400 ISO, 1/500, f11
Canon EOS-400D / Rebel XTi noise at 800 ISO
Canon EOS-350D / Rebel XT noise at 800 ISO
800 ISO, 1/1000, f11
800 ISO, 1/1000, f11
Canon EOS-400D / Rebel XTi noise at 1600 ISO
Canon EOS-350D / Rebel XT noise at 1600 ISO
1600 ISO, 1/2000, f11
1600 ISO, 1/2000, f11

As with our first outdoor results page, there's little to differentiate the above results from the EOS 400D / Rebel XTi and the earlier EOS 350D / Rebel XT. Both show similar levels of detail and noise up to 400 ISO, and a loss of ultimate detail at 800 and 1600 ISO. Interestingly though, the EOS 350D / Rebel XT appears to deliver a slightly better result at 800 ISO, especially around the foliage which appears less detailed on the 400D / XTi.

It's a very close result though and only those closely examining 100% crops on a high quality screen are likely to notice much difference. The important thing is the EOS 400D / Rebel XTi delivers smooth, low noise results throughout its range, and while noise is visible at 1600 ISO, it's by no means obtrusive.

Note: we have compared 100% crops from each camera measuring 282x136 pixels. Since the Canon 350D / Rebel XT has a lower resolution sensor, its crops therefore represent a slightly larger area relative to the EOS 400D / Rebel XTi. Consequently any artefacts visible on the 350D / XT crops would be slightly larger and more obvious than the 400D / XTi if the image was reproduced at the same physical size.

You may also wish to compare results taken with the Sony Alpha A100 of the same section, albeit on a different day in our Sony Alpha A100 review. Note the Canon 350D / XT samples on this page are different from those on the Sony page and were retaken especially for this review.

Canon EOS 400D / Rebel XTi JPEG versus RAW comparison

To compare the effect of in-camera processing and compression, we took the 100 ISO sample in Large / RAW mode, and have compared both files for each camera below. At the time of writing, Adobe Camera RAW did not support the RAW files from the 400D / XTi, so we used Canon's own Digital Photo Professional version 2.2 to convert files from both it and the 350D / XT.

We used the default settings for DPP, then transferred the data to Photoshop with 16-bit tonal depth before converting to 8-bit, then cropping and saving using the same settings as the JPEGs above. We will update this page when Adobe Camera RAW supports the 400D / XTi for consistency with our existing results.

Canon EOS-400D / Digital Rebel XTi with EF-S 18-55mm JPEG versus RAW
Canon EOS-400D / Digital Rebel XTi noise at 100 ISO JPEG
Canon EOS-400D / Digital Rebel XTi noise at 100 ISO from RAW file
Large Fine JPEG, 100 ISO, 1/125, f11
Canon DPP 2.2 conversion, 100 ISO, 1/125, f11

Canon EOS-350D / Digital Rebel XT with EF-S 18-55mm JPEG versus RAW
Canon EOS-350D / Digital Rebel XT noise at 100 ISO JPEG
Canon EOS-350D / Digital Rebel XT noise at 100 ISO from RAW file
Large Fine JPEG, 100 ISO, 1/100, f11
Canon DPP 2.2 conversion, 100 ISO, 1/100, f11

The processed RAW file from the EOS 400D / Rebel XTi at first glance appears sharper than the in-camera JPEG, but look a little closer and there's undesirable artefacts especially around the fencing. Interestingly, there's little difference between the RAW and in-camera JPEG of the 350D / XT using the file above.

Since we have used Adobe Camera RAW to process RAW images on earlier reviews, we will return to these files once Adobe supports the 400D / XTi and provide full analysis.

Canon EOS 400D / Digital Rebel XTi results

Outdoor / Resolution / Noise / Noise 2


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All words, images, videos and layout, copyright 2005-2017 Gordon Laing. May not be used without permission.

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