I was curious to try this type of filter, which isn't widely used but is very interesting for creative experimentation. K&F Concept offers a wide range of photographic products, and this filter confirms the brand's quality. I chose the 5-prism model.

Upon opening the box, you find a fairly heavy and thick nano-glass filter housed in a rigid plastic case. It's well-protected, which inspires confidence. I had some doubts about focusing, fearing it would have to be done manually, but ultimately, there were no issues: once the filter was screwed on correctly, the autofocus worked perfectly.

This filter consists of two parts: a fixed ring that screws onto the lens and a rotating part that allows you to rotate the prisms to vary the direction of the effect. It's well-designed.

In hindsight, I perhaps should have chosen a smaller diameter to use it on other lenses, particularly for architectural photography. That said, the results obtained with my 105mm lens are very satisfactory (see photos).

Honestly, I recommend it. It's a great accessory for taking original photos, with excellent build quality.