The moment I ordered this filter I regrated it, not because I knew it would be terrible, K F Concepts makes reasonably decent gear. But rather, it’s prism effect is pointless when photo editing apps are ubiquitous. And when you use an app you have precise control over the image and don’t need to permanently embed the effect on to the picture as you do with a filter. So I knew even before the lens came I had no real use for it. This is the trouble having G.A.S., gear acquisition syndrome, will get you into.

But I have so here’s my opinion of its build quality and experience with it. The filter is a thick slab of glass cut at an angle and terraced, so it gives off a “double vision” effect. It has an adjustment wheel like you’d find on a variable ND or CPL filter to adjust the angle. That’s the nub of it. It’s heavy for a filter and because it’s so thick it’s impossible to put a lens cap on it. So, it’s the kind of filter you install with a specific idea in mind and then remove.
It’s probably best for studio work rather than outside. Because the glass extends so far out it’s very easy to scratch.

As far as output quality I’ve upload a few photos I took with the filter on. They were taken with a Canon R5 II body and Canon RF 24-70 F2.8 so any lack of sharpness is the filter, not the equipment. I’ll let you judge for yourself if this filter is useful to you or if you’d be better off just simulating in a photo editor. For sure, the filter is quicker if you don’t want to muck with a photo manipulation app.