DxOMark tested the performance of the imaging sensor of the new Canon EOS R8. It gets a score of 93. Not bad. They say
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Canon R8 vs Canon 5D MIII Detailed Comparison
Результаты теста сенсора Canon EOS R8 в лаборатории DXOMARK
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Canon EOS R8 Sensor test - DXOMARK
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Canon EOS R7 Review & Sample Images by Ken Rockwell
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Camera sensor review - DXOMARK