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When using the denoising node I happen to have some distortions where the light bounces. When I increase the samples to 600 it's reduced but it still be noticeable.

What may be causing this effect? enter image description here enter image description here

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    $\begingroup$ Hi :). That's caused by too little samples, 1000+ samples should help. $\endgroup$
    – jachym michal
    Sep 24, 2021 at 12:39

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This is entirely normal. With too few samples, such as lower than 500 in this case, the denoiser doesn’t have much data to work with, and the result ends up splotchy as it tries to fake information. When more of the pixels are closer to their correct values, the faking is not as obvious.

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    $\begingroup$ So the only solution is to pump up the samples to lets say... 2000? $\endgroup$
    – Miki
    Sep 24, 2021 at 13:46
  • $\begingroup$ @Miki Two thousand should be enough for a whole lot of noise causing render items, but usually I can get away with something like 1024 with ease. 512, now that’s a bit tight but still fine in most cases. 256, pretty tight, but manageable. 128 is absolute minimum for full render IBO. $\endgroup$
    – TheLabCat
    Sep 24, 2021 at 13:48

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