Canon 80D High ISO NR
Canon 80D High ISO Noise Reduction
The Canon 80D's four High ISO Noise Reduction settings ("High, "Standard", "Low" and "Off") provide good flexibility in choosing how you want to make the trade-off between subject detail and noise levels. The camera also offers a Multi Shot Noise Reduction option which takes 4 shots, and then aligns and merges them into one JPEG image to average out noise.
See for yourself how the Canon 80D's "Standard" and "Off" High ISO NR settings compare to RAW without noise reduction under daylight-balanced lighting. (Note that these RAW images also have no sharpening applied, so they are softer than camera JPEGs at low ISOs.) Click on any of the crops below to see the corresponding full-sized image. Since the Canon 80D user manual states noise reduction is applied at all ISOs, we've included crops from the base ISO on up.
The Canon 80D's default "Standard" High ISO NR setting provides a decent tradeoff between noise and detail at low to moderate ISOs, but it is a little heavy-handed, and struggles to maintain low contrast detail at higher ISOs, especially in our red-leaf fabric (as many cameras do). We'd probably shoot with lower settings at higher ISOs and reduce noise ourselves with post-processing (or just shoot RAW). Also note how the "Off" setting doesn't disable noise reduction entirely even at low ISOs as is usually the case, though it appears to leave a lot more chroma noise behind.