Hello everyone, as a Vine tester, I had the opportunity to try the K&F Concept 58mm ND2-32 variable, CPL polarizing, and 1/4 Black-mist filter. This filter is a true 3-in-1, combining a 1/4 black diffusion filter, a circular polarizing filter (CPL), and a variable neutral density filter (ND2-32). This is a considerable advantage because it eliminates the need to handle multiple filters, making it much easier to use.
Not having the chance to enjoy a beautiful sunny day for this test, I had to resort to studio lighting. I used a 16mm lens with a f/1.2 aperture and a very low ISO to best assess the quality of the light filtration. Obviously, a test in direct sunlight would have been ideal to push the filter to its limits, but the conditions weren't right for it. Despite these limitations, I was able to appreciate the filter's high-quality construction. It's made of high-quality optical glass with a 28-layer Nano-X coating, making it dust and water resistant. Its CNC-machined aircraft-grade aluminum frame provides good friction for easy installation and removal. Controlling the ND value is easy thanks to a small handle, and the frame ring allows for CPL adjustment. Furthermore, the frame structure limits black cross phenomena, especially with lenses larger than 35mm.
This filter promises to reduce post-production work thanks to its precise control of light entry and the elimination of reflections. It offers a range of 1 to 5 f-stops (0.3 to 1.5 stops).
The price of this filter may seem high, but it's average for this type of product. The main drawback, in my opinion, is the inability to attach a lens hood. This can be a deterrent for some, especially outdoors.
In conclusion, I'm a passionate enthusiast and always on the lookout for innovative products. This K&F Concept filter seems promising, although testing in real-world natural light conditions is necessary to fully assess its potential. Its build quality and versatility make it an interesting tool.