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Caustics flickering issue

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Hi there all;

Anyone have a fix for the issue seen here - the caustics is flickering a lot. There's only a single light with a photon density of 1. Yes I know that's low - but it renders fast and gives a nice blur on stills. but the issue is clear when animated. I have a big scene with lots of objects (dynamics) so don't want to crank up the density too high as it takes a lot longer to render. Also it just gives a fine flickery grain rather than a blobby one- the flickering is still there. Anyone with experience in this effect please let me know if there's some good settings that you've found. 

Also any advice on blurry global reflection maps? I'm using a blurry hdri but can't seem to get it to render without artifacts...

Many thanks



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