Canon 650D review: measurements

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This page belongs to our Canon 650D review. The measurements for this Canon 650D test report have been carried out using Imatest. For the test method and explanation of terms, see FAQ. Conclusions and sample images are shown in Canon 650D review. review 650d by Camerstuffreview, Canon 650D review, Imatest Canon 650D

Resolution

review 650d, Canon 650D review, Imatest Canon 650D

Canon-650D-RAW-resolution
The newly developed Hybrid 18 Megapixel APS-C CMOS sensor, in combination with the DIGIC 5 image processor, is a success. In terms of resolution, the Canon 650D made progress over the previous EOS models. We tested resolution with the new Canon 40mm lens STM and we have measured the resolution of jpg files with the standard picture style and in Lightroom converted RAW files.
The in Lightroom converted Canon 650D RAW files deliver - on average over ISO 100 to 6400 - almost 2300 lines per picture height. That's a higher resolution than e.g. the RAW files of the Canon 60D, Canon 7D and Canon 600D. These cameras have a similar amount of megapixels.
The in-camera processing of jpg files is even more improved compared to previous Canon cameras with a 18 megapixrel APS-C sensor. The EOS 650D is the first EOS entry-level model with a Canon DIGIC 5 image processor. Perhaps this allows the use of better sharpening algorithms in the Canon 650D. In previous reviews, Canon EOS cameras showed lower resolution for jpg files than for non-tweaked RAW files. But for the Canon 650D the difference is negligible. Jpg files from the Canon 650D reach an average of 2200 lines per picture height, which is even better than the resolution of Canon 5d MK2 or Canon 5D MK3. Resolution is constant over almost the entire ISO range. Only at ISO 25600 the resolution of the jpg files suffer under noise-suppression.

Dynamic range

In terms of dynamic range, the new Canon sensor performs reasonable. Here you see the test results for a 400 ISO jpg file. The total dynamic range is 9 stops for a 100 ISO file. This applies to both a jpg file and a RAW file. With higher ISO settings, the dynamic range slowly decreases. These values are slightly lower than we are used to from Canon. test 650d,Canon 650D test, Imatest Canon 650D

The signal / noise ratio in the shadows reduces the dynamic range of jpg files to a usable dynamic range of 6 stops at ISO 100 to 1.5 stops at ISO 25600. The noise at high ISO 25600 makes this setting unusable.
The jpg files perform, by in-camera noise, at all ISO settings seemingly better than the RAW files. Yet that is not so. We test the RAW files without noise reduction using. Thus you maintain the highest possible detail in the recordings, while the noise although measurable, but not visible in print. If you carefully contrast, sharpening and noise reduction optimizes RAW files, it is possible to open RAW files usable dynamic range to achieve that better or equal to that of the jpg files.

A 100 ISO RAW file with careful noise reduction delivers half a stop higher usable dynamic range than a jpg file.

650D-useful-dynamic-range

High Tone Priority: 1/2 stop larger dynamic range

Through the custom settings you can use the 'High tone priority "setting. The recording is first 1 stop underexposed. This will protect the highlights, but the noise is slightly higher. In the light tone priority is not 100 ISO setting available. You would expect that the high tone priority setting by the applied underexposure leads to a lower dynamic range. But to our surprise we measured with Imatest a usable dynamic range for both jpg files as RAW files half a stop higher than without high tone priority. Dpreview shows similar findings in their Canon 650D review.

Noise

In terms of noise, the Canon 650D the slightly less well in our test than the Canon 600D. The noise from RAW files created by daylight of the Canon 600D and Canon 650D are identical. But the jpg files from the Canon 600D to show less noise than the Canon 650D. Possibly fit the Canon 650D slightly less noise reduction. In practice shots is starting to recognize ISO 1600 color noise in jpg images taken with the Canon 650D. See the example in the Canon 650D test.
Comparison of noise in jpg files with the measured noise in RAW files without noise reduction, shows that the jpg files noise occurs at all ISO settings.

650D-jpg-noise
Below are examples of right 4 Canon 650D RAW files taken at different ISO settings. The cropping show a detail when the picture in full size on your screen would show. On the RAW files, no noise reduction applied, so this is a worst case scenario. Through noise reduction to apply for RAW files to achieve a better result.

The signal to noise ratio of a number of modern cameras is very close to each other. Below 3100% cropping of 3200 ISO shooting in RAW a gray card, made with the Canon 650D, Nikon D3200 and the Olympus OM-D E-M5. The Olympus OM-D E-M5 and the Nikon D3200 are less affected by noise than the Canon 650D. On the face of the differences are small.

650D-RAWnoise
3200ISO-RAW-noise-comparison Canon-650D-noise-examples

Color accuracy @ daylight

650D-daylight-color-accuracy
Daylight color accuracy (Delta E94)

DaylightRAWjpg
Average4.86.5
Best4.46.1
Worst5.57.1
Skin tones7.65.2
Natural Colors5.68.0
Bright Colors5.47.2
White Balance1.73.7
The Canon 650D delivers RAW files with a color, which in daylight set to auto white balance and the standard picture style, as well as the color of the Nikon D3200 . The Canon 5D MK3, the Olympus OM-D E-M5 and surprisingly also the Canon 600D scored just slightly better than the Canon 650D, in terms of color reproduction in daylight. But the differences in color are now so small that most people will not notice.

The illustration shows the color error of a 200 ISO jpg picture is taken in daylight. The further the ideal color (square) is removed from the color of the camera (circle), the greater the color difference. Interestingly, the colors of the jpg files slightly less saturated than the reference colors, especially in yellow (Nos. 7.12 and 16) and cyan (Nos 6 and 18). Usually we correctly saturated colors, with jpg files. For the test method and explanation of terms, see FAQ.

Color accuracy @ Tungsten light

Color-accuracy-650D-tungsten-mini
Tungsten color accuracy (Delte E94)

Tungsten lightRAWjpg
Average2119
Best2018
Worst2219
Skin tones2017
Natural Colors2422
Bright Colors1715
White Balance2817

When artificial light can, both for the jpg (picture style: standard) as RAW files, not blindly trust the auto white balance, as clearly seen in the results shown for a 200 ISO jpg file. The color in artificial light of the Canon 650D with an average of nearly 20 Delta E94, worse than that of competing cameras like the Nikon D3200 or Olympus OM-D E-M5 (both with Delta E94 = 10). Interestingly, the color cast is not constant: the color deviation of orange and yellow (Nos 7.12 and 16) is very small. Most colors tend to orange, what to expect in artificial light, but the dark colors (Nos 8 and 13) tend to green.

Ivo Freriks
Author: Ivo Freriks
With Camera Review Stuff I hope to make a modest contribution to the pleasure that you get from photography. By testing cameras and lenses in the same way, evluating the results and weighing up the pros and cons, I hope to help you find the right camera or lens.

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