I wanted a "creative" filter to keep in my bag when the scene is too clinical: harsh point lights, aggressive reflections, dry skin tones, video that looks like it's already finished in post-production before it's even started. I chose the K&F Gold-Mist 77mm to find a precise compromise: light diffusion + a hint of warmth, without turning everything into fog.

The effect, at least in the gradation I used, is subtle but recognizable. Highlights (lamps, reflections on metal, backlighting) take on a soft halo with a more "golden" than "orange" hue. It's not a filter that drastically changes colors: it shifts the atmosphere, not overturning the palette. Upon closer inspection, the reduction in contrast is more evident in reflections and micro-contrasts than in deep shadows.

I didn't notice any significant changes in exposure: if there is any loss, it's very small, and I didn't have to systematically compensate. The subject's sharpness remains legible; However, as is natural with a mist, the perception of "micro-engraving" diminishes slightly when you're looking for 100% detail. This is an aesthetic choice, not a flaw.

Tested on a Sony 70-200 f/2.8 GM II and a 24-105 f/4: the thread is clean, it tightens and loosens without any unusual friction, and the ring seems well-made. I didn't see any abnormal vignetting on the 24-105 at the wide-angle end, which was a slight concern for me with non-slim filters; here, the thickness is well-managed. The surface treatment also helps in practice: fingerprints and drops come off fairly quickly, without having to scrub too much (and this makes me strangely happy, because with certain cheap filters, it quickly becomes a struggle).

I have a slight hesitation about "universal" use: on already warm scenes or under certain artificial lights, it can be easy to overdo the golden mood, especially if you then push the WB even further in post-production. It's not a filter issue, it's more a question of moderation and context.

If you're looking for a clear "80s glamour" effect, this is probably too polite. If, however, you want a light, cinematic sheen, with gentler highlights and a controlled warmth, then it makes sense.