A combination of a variable polarizing filter (N2-32) and a magnetic 1/4" black-mist filter, along with a magnetic ring for attaching to the lens, was tested at 82mm with my Canon lens on various lenses, including step-up rings when needed. A lens cap completes the trio, eliminating the need to remove the ring.

The polarizing filter doesn't have a crosshair marking; the effect is fairly consistent across the entire spectrum and doesn't impact image sharpness. The 1/4" black-mist filter provides diffusion, the intensity of which varies depending on the light source. Aside from very strong backlighting, I find it suitable for most situations. At night, with city lights, it definitely provides a more pleasing effect with a soft glow/halo around light sources. In daytime portraiture, it also softens the clinical look of modern lenses, resulting in more flattering skin tones.

The magnetic system is a major plus in terms of ease and speed of use; it holds very well and there's no need to screw or unscrew the filters. The build quality is excellent, and everything comes in a high-quality, thick fabric pouch—one of the models K&F sells specifically for this purpose, and one I already use to store my filters from various brands.