Imatest Canon 1Dx review

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This is an attachment of our Canon 1DX review, containing the results of our Imatest measurements. For the test method and explanation of terms, see FAQ. Conclusion and sample images are shown in the Canon 1DX review. Canon-1dx-test

Resolution Canon 1Dx

The resolution of the Canon 1DX, was tested using the Canon 40mm STM lens. This lens scored very high in our lens reviews. At low ISO settings, the 1DX scores slightly lower than the Canon 5D MK3, which is given the number of megapixels on the sensor according to the expectation. Even so, the Canon 1DX camera scores in our test summary slightly higher than the Canon 5D MK3 for resolution in our camera review overview. This is due to the higher signal to noise ratio of the 1DX at high ISO values. Although the detail due to noise reduction decreases at the highest ISO settings, the MTF50 remained high.

Imatest resultaten Canon1dx resolutie

Dynamic range

The dynamic range, especially the usable dynamic range of the Canon 1DX is impressive. The measured total dynamic range of a RAW file below 800 ISO is almost 11 stops (Dmax = 3.4). That in itself is very good, but for photographers the usable dynamic range is much more important. There are several cameras that have a total dynamic range of 11 stops, but there are few cameras that show little noise in the dark. For the test method and explanation of terms, see FAQ Imatest Dynamic Range Canon1Dx
The Canon 1DX has such a good signal / noise ration that we have measured a usable dynamic range of 7 stops at the lowest ISO settings. The jpg files perform, by in-camera noise reduction at all ISO settings in our chart seemingly better than the RAW files. Yet that is not so. We test the RAW files without the use of noise reduction. Thus you maintain the highest possible detail in the images, while the noise although measurable, will not be visible in print. If you carefully adjust contrast, sharpening and noise reduction in RAW files, it is possible to achieve a usable dynamic range for RAW files which is  better or equal to that of the jpg files. Bruikbaar DynamischBereik Canon1dx

Noise

Cameras with a full frame sensor all show little noise, due to the large pixel size. But even among these full frame cameras, the Canon 1DX is one of the very best cameras if you look at the noise in jpg or RAW files.

Comparison of noise in jpg files with the measured noise in RAW files without noise reduction, shows that the jpg files Noise occurs between 400 and 800 ISO. If you have the noise reduction to 0 (of brightness AND color), you can even 6400 ISO file impunity print without you suffer from noise.

jpgnoise

Below are examples of a gray card shot at different ISO settings. These 100% crops show a detail from a RAW file without any noise reduction. By applying noise reduction to the RAW files you will achieve even better results. In our Canon 1Dx review we provide you with two samples of images shot at 51.200 ISO, which still yielded good results.

Bottom right you see a 100% crop of an ISO 3200 jpg image. No noise to see!

RAWnoise
Noise 3200ISOjpgcrop

Daylight color accuracy

daglichtkleurminiFaithful
Daylight color accuracy (Delta E94)

DaylightRAWjpg
Average4.65.7
Best3.75.2
Worst8.06.5
Skin tones4.66.3
Natural Colors4.05.5
Bright Colors4.05.9
White Balance2.52.4

For this color accuracy test we converted the RAW files using Lightroom, using the camera calibration settings shown to the right. The illustration shows the color error of a 200 ISO RAW images taken in daylight. The further the ideal color (square) is removed from the color of the camera (circle), the greater the color difference. Only the orange and magenta colors (like 7 en 17) are slightly oversaturated. These are very good results for the Canon 1Dx.

cameracalibration

Color accuracy in tungsten

jpg100tungstenmini
Tungsten color accuracy (Delte E94)

Tungsten lightRAWjpg
Average1515
Best1314
Worst2215
Skin tones1817
Natural Colors1515
Bright Colors1211
White Balance1711

When shooting pictures in tungsten light, you can not blindly trust the auto white balance, as clearly can be seen in the results shown here for a 200 ISO jpg file. All colors shw a tsrong orange color cast. This is nothing special, almost all cameras we have tested to date showed an orange color cast in tungsten light when the autobalance was applied. This color deviation is conveniently eliminated in RAW files by adjusting the white balance. This can be done by adjusting the white balance on the camera. Even better results we obtained by adjusting the white balance afterwards in Lightroom.

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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