Product being reviewed: K&F Concept 72mm Black Diffusion Mist Effect 1/4 & Variable ND2-32(1-5 Stops) & Circular Polarizing Filter CPL-in 1 Lens Filter with 18 Multi-Coatings for Camera Lenses (K-Series)

This polarizing filter by K&F Concept is interesting in that it's adjustable with a slider on the side of the lens to achieve different ND values. On top of that, there is another adjustment ring to fine tune the CPL. Now I'll be the first to admit that this is more advanced than I'm used to; I have a Fujifilm X-T5 and am amateur at best. That being said, it's been fun to mess around with this filter. I've had varying results on my photos; some seem no different than without the filter, and others have weird shadowed areas, I believe due to the CPL. This is a learning curve that I'm still working on. This can impact colors in your photos, so mess around with the filter a lot if you don't know what you're doing.

Some things to note when using this filter:
-No lens cap, hood, or additional filters will fit it.
-Since the adjustment slider sticks out, it's best to remove this filter before storing your camera to avoid damage.
-Takes time to adjust and dial in the right settings for your situation and not for fast shots.

The filter itself seems well made. I have mild concerns about sand or other small dust particles getting in the sliding mechanism, but no issues so far. K&F filters are usually a really good value and I think this one is as well since it does two jobs (ND and CPL). Recommended as long as you understand what you're buying.