I have reached that stage in my life where my face looks less like a fresh peach and more like a crumpled paper bag that has been through a wash cycle. This K&F CONCEPT black diffusion 1/4 filter is essentially digital Botox for the action camera crowd. I can just snap it on and suddenly I am living in a dreamy 1990s perfume advert rather than a harsh 4K reality. The installation is so simple that I can do it even with my clumsy thumbs. I just press it on and the little anti-slip washer keeps it from flying off into a bush when I am doing something supposedly adventurous.The glass is actually proper high-definition stuff with twenty-eight layers of nano coating, so when I inevitably get my sweaty fingerprints all over it or a bit of sea spray hits the lens it is remarkably easy to wipe clean with the provided tiny-weeny cloth - really, they ought to make these cloths a little more generous. It comes in a sturdy storage box which is brilliant because I usually treat my gear with the same care a toddler gives a cardboard box, ahem!Looking at the results I can see a massive difference. On the unfiltered side of things every stray hair and skin blemish is screaming for attention under the winter sun. Once I apply the filter the highlights get this gorgeous hazy glow. It softens the edges of the world. It is the visual equivalent of a warm hug or a soft-focus dream sequence where I am finally the hero of my own indie flick.The effect is definitely useful if I want that cinematic look without spending hours in an editing suite trying to fake it. Is it too subtle? Not for me. It hits that sweet spot where I look better but people do not immediately ask why I am filming through a layer of Vaseline. It is a specific vibe that it gives to film and photos, and in that respect, if I want to look like a rugged survivalist this might make me look a bit too much like a romantic lead in a Romcom. For vlogging though, and making the harsh sun behave itself, it is a total winner.