Use it as a protective filter, no noticeable degradation on the Sigma 150-600 FE.
08/12/2022
bought this filter without the knowledge of the company. I still don't know anything other than what I've observed: it appears to be of quality construction, and most importantly, I took it out to shoot and the clarity and visual performance of my favorite wide-angle Nikon lens remains just as superb as always. So a quality filter at a very good price.
07/12/2022
had previously used a common UV filter. It's not bad. Only under certain conditions would glare or aberration occur. For the most part it worked fine. But it still annoyed me. So I ordered this K&F UV filter. WOW! What a difference! The glass is so clear you can't tell it's in the case! And that's how clear my photos became with it! Definitely worth the price difference! All my filters are now K&F brand. The quality is excellent!
05/12/2022
I recently went on a beach vacation and wanted to protect one of my favorite primates from the salty air and sand. The results were flawless, I could not detect any chromatic aberration or color fringes. The metal thread is a real plus offering a secure fit for peace of mind.
04/12/2022
Have filters from B + W Hoya Pro Filter etc. That seems to be ok. No defects noted so far. Test will be how it holds up over time.
03/12/2022
K&F only made a few versions of UV/1A filters and this one falls in the upper price range. The packaging is excellent and the glass material is very good. So far I haven't noticed any color changes. The design on the metal rim offers easy installation/removal unlike others that sometimes require a filter wrench. It might not be the best filter (price wise) but at 30eur it's well worth the money well spent protecting my glass which already costs over half a grand. I trust the products of this company and will buy them again.
15/11/2022
Very good value for money, as a dash photographer I can't tell the difference between K&F UV filter and the one I bought on another camera and paid 4x the money.
14/11/2022