The K&F Concept 52MM Multicoated UV Filter is a high quality product. Its build quality is neck to neck with major filter manufacturers like Hoya and Nikon. It comes with an oversized case which I find too bulky. I like the smaller Hoya cases. Nevertheless, in the case of a UV filter, you would probably leave the filter on the lens 100% of the time so there is no need to carry the case.

In terms of optical quality, it beats my old Nikon L37 52mm by a mile. My L37 is like not having any coating at all and is very reflective. The K&F has a green cast on the reflection, indicating the presence of multicoating. Looking through the 2 filters one at a time, the K&F immediately shows higher contrast. Wow, what have I been missing? I will replace my L37 with the K&F immediately on my old 35mm lens!

When compared with my Nikon L1Bc 52mm, they look fairly similar in reflection and in transparency with the L1Bc perhaps a hair better in muting the reflections. In other words, the K&F Multicoated UV Filter is very comparable to the performance of the Nikon L1Bc without the intended red tint on the L1Bc.

In conclusion, the K&F 52MM UV filter is an excellent filter for lens protection without affecting much image quality. It will replace my old L37 immediately. I am very pleased with it.

Pros:
- High quality build
- Comparable to major brands like Hoya and Nikon
- Excellent optical quality
- Multicoating reduces reflections
- Higher contrast than Nikon L37
- Comparable to Nikon L1Bc without red tint
- Good lens protection

Cons:
- Oversized case is bulky and I prefer smaller Hoya cases