Canon R5 help...weird swirls in images

Quarkcharmed wrote:

Pmm85 wrote:

The R5...I still think is noiser than my 5D IV when it comes to needing to pull detail from shadows in low light, but at least the rings/swirls are sorted out.

The R5 is much less noisy than 5DIV, if you shoot in the game conditions and settings. I had 5DIV and can compare.

If your R5's images are noisy, there's something wrong with either the camera, or settings, or workflow.

... or manner of inspecting. Lots of people don't fully understand the role of pixel size in both the magnification that they inspect at, or the effect it has on the default sharpening in a converter. Converters' "Sharpness" controls operate at the pixel level, which is a different image frequency for different pixel counts, for the same sensor area used. So, converters assume that the user wants pixel-level sharpness, no matter what the pixel size is, making cameras with smaller pixels seem noisier, as an illusion. For larger pixels, the sharpness mainly tries to recap the analog micro-contrast contrast lost to the AA filter, and for much smaller pixels, it is also trying to compensate for diffraction and aberration, too, which attenuate neighbor-pixel contrast more with smaller pixels. If the converter doesn't do this extra sharpening with smaller pixels by default, the user will likely do it.

Check if you have something like highlight tone priority or electronic shutter enabled (don't use electronic shutter at ISOs less than 800).

Electronic shutter is noisier at all ISOs, mainly in the deepest shadows at low ISOs, and reaching into higher tones at high ISOs. The difference is quite visible at ISO 51,200. There's a difference between reading out the sensor in 14 bits and then quantizing to 12 bits, vs reading out in 12 bits to begin with.

HTP isn't too bad in 14 bits, but HTP plus 12 bit e-shutter is a bit worse than just HTP or just e-shutter. The fine horizontal banding noise is worse in 12-bit e-shutter; it disappears readily with downsampling or NR or filtering, but may be a nuisance with high magnification of the original resolution.