Purchased this lens filter as I was looking for a filter no thicker than 3mm, that would fit inside a new Haoge lens hood (that can’t take thick filters) for my X100V, to protect the lens and make the camera weather sealed – if you don’t know about the new X100V, it needs a filter to be weather sealed.After a bit of hunting for a 3mm thick filter, I found this filter by K&F Concepts on Amazon. I was sceptical that it was only £5.99, and there were some complaints of a colour cast; however, I thought I would give it a bash for the price.The box it arrived in isn’t the greatest but it did it’s job and the filter arrived unmarked. I held it over a white surface and I could indeed see a slight brown coloured tint; however, I don’t see any colour cast in the images. If you hold the filter against the light you can see a purple reflection, I tried to show this in the images but it’s a bit blown out. It looks very much like the anti-reflective coating you get on spectacles - I don’t mind it.Overall, I’m amazed, it’s actually a really good filter with good flare control and no obvious ghosting – I was shooting into the sun yesterday and it performed really well. I’ve purchased far more expensive filters in the past that weren’t this good.Recommended – thinking of buying a second one as a spare!