We shoot a specially designed chart in carefully controlled conditions and the resulting images are analysed using DXO Analyzer software to generate the data to produce the graphs below.
A high signal to noise ratio (SNR) indicates a cleaner and better quality image.
For more more details on how to interpret our test data, check out our full explanation of our noise and dynamic range tests.
JPEG signal to noise ratio
While the Pentax K-30 wins this particular battle it's worth noting that it has a significantly lower pixel count (16.3 million) than the other cameras in this group. The Canon 70D competes well against the other cameras up to about ISO 800 when noise levels increase and the signal to noise ratio dips.
Raw signal to noise ratio
This graph indicates that apart form at the lowest sensitivity setting the Canon 70D has a lower signal to noise ratio than the 18MP Canon 60D, which indicates that images may be a little noisier.
JPEG dynamic range
Canon cameras tend to produce nice punchy images with a pleasant level of contrast straight from the camera which means that the dynamic range of their JPEGs is a little restricted. Nevertheless, the Canon 70D performs well here, only being beaten at the lowest sensitivity settings by the Nikon D7100.