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I tend to specialize in restoring vintage photos & Affinity Photo is excellent for that.
Sometimes the only image I can get is photocopied so that when I scan it the result shows halftone dots & suffers from the Moire effect.
Affinity's FFT Denoise filter usually takes care of that but I don't really understand how to use it properly. In the dialog box there are various settings available to do with brush size/hardness/flow/opacity etc but I'd like to know more on how to use these & which points to click on (or not).
I saw one of Affinity's video tutorials which shows it in operation (and a few posts in the forum) but it doesn't explain how different settings affect the result.
Are there any other guides to using this very useful tool?

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It is very much a case of suck it and see. The highlighted spots in the FFT diagram denote frequencies characteristic of regular noise. You could take a gradual approach by erasing the brightest quartet of spots first, then see how that looks; then the  next brightest quartet and so on.


Windows 10, Affinity Photo 1.8,5 Designer 1.8.5 and Publisher 1.8.5 (mainly Photo), now ex-Adobe CC

CPU: AMD A6-3670. RAM: 16 GB DDR3 @ 666MHz, Graphics: 2047MB NVIDIA GeForce GT 630

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