First, it controls noise better than many DSLRs. As with any camera, we see increasing noise with longer exposure, and decreasing saturation, but the XTi does very well, compared to other cameras. Low light images were shot at ISO 400, adjusting just the shutter speed to see how the Canon Rebel XTi handles long exposures. We shot our low light tests with the Canon Rebel XTi set to ISO 400, and adjusted the shutter speed for exposures at 60 lux which is just enough to be comfortable for reading 30 lux, which is like a gloomy basement 15 lux, which is like the light from a few candles and 5 lux, which is very dim. Imatest generates our test results by analyzing our shots of the GretagMacbeth chart. It has a noise reduction setting, which shows a good effect above ISO 800. Noise increases as ISO rises on any camera, but the XTi's noise starts relatively low and increases relatively slowly. Image noise is the electronic equivalent of grain in film or static in a radio signal – it's simply stuff that interferes with the real data. That's a high ISO for this test, but because the camera does well on noise even at high ISOs, the final result isn't that bad. The auto noise result is roughly equivalent to the XTi's performance at ISO 600. Because the Canon Rebel XTi lacks a spot metering mode, the camera set the ISO high when we shot the chart against a black background. To an extent, it depends on the camera's metering system, because the meter reading influences the algorithm used to set ISO automatically. Our test for noise at the auto ISO setting is run just the way our manual ISO test is done. With optimal sharpening, done in post processing, or in-camera, its results ought to be very crisp. The Canon Rebel XTi resolved 1531 lw/ph horizontally with 18.6 percent undersharpening, and 1662 lw/ph vertically, with 17 percent undersharpening. Imatest reports resolution in line-widths per picture height (lw/ph), a measure that's independent of the camera's sensor size, and therefore comparable from camera to camera. The Canon Rebel XTi did best at f/10 and 22.28mm and did well compared to the competition.Ĭlick on the chart above to view the full resolution image We shoot at a variety of focal lengths and apertures, looking for the camera's best performance. We test resolution and sharpness by shooting an ISO resolution chart designed for digital cameras, and running the images through Imatest software. The Canon Rebel XTi did a fine job rendering it, as shown below.Ĭlick on the image above to view the full res. Contemplate it when you feel a little down. Our still life scene brings new hope for the wretched. It's rare for a camera to do as well as the XTi on this test. Its 5.45 mean color error is better than the more-expensive Canon EOS 30D. Its saturation score is 100.3 percent – very close to perfect. Canon says the Faithful style optimizes color accuracy, and the XTi's performance is excellent. We tested the Canon Rebel XTi in its "Faithful" picture style, and we set color balance manually.
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