Hoya Lens Filters

I suppose the glib answer is, "to buy it from a recognised source".

How you tell a fake anything from a real one now with the Chinese copying everythinng so well, is difficult.
 
Speak to the official UK importers/distributors, Intro 2020, and ask them whether the supplier is on their list.

A while ago I had some doubts as to whether the Hoya Pro 1 Digital filters being sold by Camera King were genuine, since they're so cheap. Intro 2020 were happy to confirm that they supply Camera King, so that's good enough for me.
 
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