Review on 📷 K&F Concept 67mm ND 8 Filter and CPL Circular Polarizing Filter 2 in 1: Multi-Resistant Coating, Ultra Clear & Waterproof by Russell Robertson

I ruined 2 boost rings because of that thing. It gets stuck and I have to use filter wrenches with pliers to remove it. I never had this problem with my other k&f filters. The first time it was a new (to me) proprietary adapter. The second time it was an adapter I've had for a while and never had any problems with it. Not sure if it's just soft metal or thread depth, but I've stopped using this filter and ruining my adapters. Visually everything is fine. On par with other k&f filters. Not the best, but definitely the most profitable. I use other filters (nd, cpl, vnd, diffusion) regularly.