Blurry images

[mjjlvc]

Hi everyone! In last few weeks all of my renderings have that "blurry feel" and I can't produce sharp images. I read all threads regarding this subject on this forum, and I still can't find solution, tried everything ... Using Max 2021, Corona 5, tried Corona 6, same thing happens!
Example:
https://ibb.co/F89XHMk

[TomG]

Is this only in IR? Have you checked the Image Upscaling Factor in the System Settings? (Render Setup -> System Tab -> System Settings)

See https://coronarenderer.freshdesk.com/support/solutions/articles/12000060305-what-is-image-upscaling-factor-

This should be set to 1 (sometimes though, updating Windows, changing resolutions, swapping monitors, or other such changes in the system for some reason makes it change to a value of 2).