Fixing Blur issues when rendering 4k ?

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1

I’m considering getting a commercial license from TM (since the appearance of Lumen). but I have a hesitation because the videos I produce are quite blurry, with certain artifacts, spots, discreet but I see incomparable animations on YouTube even when viewing them in 720p.

example, my video: https://youtu.be/3lEar6haCQk

compared to one of my D5 animations also rendered in 2k: https://www.youtube.com/watch?v=DirsYg2_Gzk

or even on this channel an ultra clear and fluid animation: https://www.youtube.com/watch?v=Cqf_LLNNTe8

My D5 render animations were sharper

I wonder if it’s because of the max 2k resolution?

Is it better to make the renderings in 4k and then host them on YouTube?

My pc is an Intel I7 nvidia RTX 3060 card

Thanks in advance for your advice

2

Hello.
I tried today to incease the “sharpness” settings wich is by default O.
(ambience/camera settings/camera effects/sharpness)
It works quite well
https://youtu.be/Ftw0Ue5P7i0