I’ve been a fan of K&F Filters, and many of their other photographic products, for some time now, and have come to appreciate the consistency and the quality of the brand. The majority of my lenses live their lives with a K&F Concept UV protective filter on their front element. I have done enough testing of the transmittance and sharpness of K&F UV filters in the past that I now consider them a trusted brand; I feel confident in their quality. And that’s the point, right? In my opinion, they’re a trusted seller. I needed a protective filter for a 24mm – 70mm zoom lens I recently purchased; the ultra-slim frame of the MCUV filter is why it became of interest to me and the reason I ordered it. And for that reason, it worked out well; when the lens is set to its widest focal length, 24mm, the Ultra-Slim filter doesn’t infringe on the image area. Therefore, it doesn’t introduce any vignetting. UV filters have an efficacy when recording on film, even though some emulsions are/were formulated to be insensitive to UV light, but have little to no added benefit when capturing to a digital sensor. Modern digital sensors, unfiltered, record the entire spectrum of visible light, as well as portions of the spectrums of invisible infrared and ultraviolet light. In order to record only visible light, so photographs appear the way we see the world, digital camera manufacturers install what is called an IR Cut Hot Mirror filter over the digital sensor and its Bayer Array. Digital cameras sold without this filter are referred to as a “Full Spectrum Camera.” If you’re not sure if your camera is full spectrum, it’s not. Which means you don’t need to filter out UV light, the manufacturer has already taken care of that for you. In the case of my digital imaging, I use UV filters to protect the front element of expensive lenses. And in that respect, the K&F Concept MCUV Filter provides protection for expensive lenses without impacting camera settings or image quality, in effect providing inexpensive insurance. If by chance it does provide any extra UV filtering, that’s a bonus. The physical attributes of the filter are, without exaggeration, its near featherweight, along with facetted chines on its circumference, for grip. I use a 67mm – 62mm step down ring with the filter, and the threaded front of the filter provides plenty of depth for the secure attachment of the ring and consequently, the stacked filter to go with it. The K&F front lens cap provided with the filter is a match in quality, if not an improvement, to the OEM lens cap that came with the lens. The pinching levers are easy to use, firmly spring-loaded, and provide a firm grip to the filter or the lens. As I noted at the beginning, I’ve come to rely on the quality of K&F filters, and for the reasons that the seller asserts, but most importantly to me, the high quality of their AGC multi-coated, anti-reflective glass; AGC a Japanese company, is the largest manufacturer of glass in the world. Another reason I have confidence in K&F filters. The filter is supplied with a lens cap, a lanyard for the lens cap, a high-quality microfiber lens cleaning cloth and a plastic storage case. K&F Concept provides plenty of value for your money and they don’t cut corners.