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This is a test of the camera's noise levels. The higher the signal to noise ratio, the greater the difference in strength between the real image data and random background noise, so the 'cleaner' the image will look. The higher the signal to noise ratio, the better.
JPEG analysis: The Fuji X-A2 has the best signal to noise ratio of the group, though the combination of an APS-C sensor and a relative low resolution (compared to the Sony A5100 and Nikon D3300) will help.
Raw analysis: The results from these cameras's raw files are much closer, though the X-A2 is still near the top of the group, this time beaten – just – by the Panasonic GM1. It's a solid performance from the X-A2, which confirms our real world findings that its raw files don't suffer excessively from noise.
