Not sure if this is relevant but I find DXO Photolab (v5) NR sometimes gives a very pronounced colour cast which I've found difficult to correct. LR AI NR seems pretty consistently correct. I've started to use LR denoising for everything, even though each file takes about 3 minutes on my machine.
I don't know if this is relevant but scans from 35mm film always look terrible , even using the best scanners (eg the Coolscan ED5000). But when printed they don't look anywhere near as bad. I find that modern noise reduction software can reduce the grain on a 35mm scan quite considerably.
I've never heard of them being called polarising screens in 40+ years of using them........ And they fit over the front of the lens like a filter.........
A plug here for "Britain in Focus", which was repeated on BBC4 recently. It's Eamon McCabe presenting a history of Photography in the UK. It's a repeat from 2017 IIRC and is now available on I Player.
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