I tested this filter on a Samyang 85mm F1.2 and a wide-angle lens. It screws on perfectly and rotates smoothly to adjust the focus.

This type of filter allows you to break the plane of focus, with the central band unaffected (in theory), then the sides, where the dioptric filter acts as a magnifying glass.
This allows you to create various effects, such as breaking the focus on the sides of a subject when the scene is distant, but it also allows you to bring a subject back into near-macro focus while also maintaining central sharpness on a more distant point.
This is quite clearly visible in my first test photo, where we have a sharp foreground, then blur, then a sharp plane again, then blur again. In the second, I have a piece of branch in macro on the sharp side (as much as possible), then the focus is 15 meters further away in the center. The effect is therefore symmetrical depending on the orientation of the slit in the filter, allowing you to place a nearby element on the ground in a landscape in focus, plus focus on the horizon and blur what's between the two planes.

There are some limitations, however: at an aperture of F1.2, it's almost impossible to achieve any sharpness anywhere and at any focusing distance with this filter. So, I went down to F2.8 for these photos, and even then, there's a strong diffusion effect, especially against backlighting.

With a longer focal length, the filter tends to blend better into the image, whereas with a wider angle, it begins to stand out more at the boundary between the glass on each side and the empty space. With front-on lighting or very slightly off-camera lighting aimed at the lens, you can also create flares and reflection/refraction effects.

With ideas, there will be quite a few interesting things to do with it.