A reall mixed bag. Value to be had, but buyer beware
K&F is a Chinese company, presenting as based in the UK. The filters I have bought from them are fine. Not amazing, but not bad at all. In terms of value for money, they are squarely in the "you get what you pay for" category. And what you pay for is a serviceable but not quite as good alternative to the likes of Tiffen or Moment. Your free shipping options involve a wait of anywhere from 2-6 weeks for the lens to leave China, sit in a holding pen somewhere, get their flight delayed, clear customs and eventually get to you via Hermes, the God of lost parcels. Any attempts to speed this along or ask for a refund will be politely declined. Seeing their reply, this is interesting as my first filter took three weeks, and the second is looking at about six (it still hasn't arrived). It's nice that they've made their set up clear here on trustpilot, but it's nowhere to be found on their site. I've purchased a couple of filters from them. I like them. But next time I'd likely buy through Amazon to better protect myself.