El filtro es tan fino, translúcido y reflection-free que NO LO VEÍA, y estuve evaluando cómo justificar la ausencia de un producto inexpugnablemente retractilado. Tardé varios minutos en darme cuenta de que sí que estaba, enroscado a la tapa, je je je.
Lo uso en mi óptica favorita de los 80’s, el 20/40 mm. de la Pentax Auto 110 y funciona excelententemente.

This little set from K&F is actually really nice. Not only do you get a well made 55mm UV filter, you get a spare lens cap, a cleaning cloth and strap for attaching it.

Everything comes in a clear case. I would have liked to have seen a separate case for the filter but as it will most likely be fitted to one of your lenses it isn't really needed. The filter is actually really good quality and easy to attach. The lens cap is the pinch type. Which means it can be used with a lens hood.

Overall a cracking little set.

I’ve been a fan of K&F Filters 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 new lens I purchased, a 28mm; 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; it 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 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, it already is.

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.

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 is a Japanese company and 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.

This MC UV Lens Filter has been a great addition to my gear. I already had a CPL filter from K&F and it is around the same size. The build quality is good. It's super slim, feels sturdy and reliable, and no vignetting from what I saw.

The coatings on this filter reduce reflections and ghosting. I tried sunny and cloudy conditions and the filter worked great with both. It also works as a protector for my main lens. As a physical barrier against dust, dirt, scratches, and accidental bumps, it gives peace of mind.

Finally, it does include a lens cap and cleaning cloth which are nice. The cap fits securely and the cleaning cloth is just your standard microfiber. I would say this filter is a great value for the price you pay.

Please note I’m not an expert and nor do I own any equipment that can test the manufacture’s claims. I can only compare my experience with this filter vs my Hoya and B&W filters. I got the 58mm filter. The filter come in a semi-hard case. The filter kit includes a micro fiber cloth, pinch lens cap, and lens cap tether.

The filter was clear and I didn’t notice any blemish in the filter. It threaded onto my Olympus 75-300mm II lens without any issues. Usually cheap filter can cause extra flaring or ghosting in your image when you have a strong light source. I took a several test pictures of different light sources and I did notice a very minor flaring/ghosting in the image if pointed just right at the light source. Another issue that cheap filters can cause is poor autofocus or decrease in image sharpness. I did not notice any of those issues. I did not notice any vignetting with this filter in place.

K&F Concept sells several different UV filters. This is their basic filter which has 18 multi-layer coating but (according to their marketing material) is not Waterproof or Scratch-Resistant. K&F Concept does sell pricier UV Filters that will provide those features if you need them. For the low cost these sell for, I don’t feel you can go wrong with this filter if you want a basic UV Filter to protect your lens.

K&F Concept very slimline polarising 77mm lens protective cover.
I like these lens protective filters because they are very high Quality Steel with polarising glass in one of thinnest threaded and lightweight I could find.
The ultra thin high quality glass not only protects your glass
(lenses) but to also with a twist can change the polarising to obtain the best possible photos for the lighting conditions. The lens also has multiple special coating layers to intensify colours with reduced solar flaring glares in images.
I highly recommend the K&F Concept lens covers as I have the K&F on all my RF and on all my older EF lenses.
A clean camera lens (front), with a clean (dust, lint free) K&F attaches together should remain thus unless unscrew - remove the cover.

Literally a complete cleaning kit to get dust off, and keep dust off. Cleaning cloth to clean in the first place, and a lens cap that fits snugly but easily removable with a quick pinch... and a mini-lanyard to avoid losing the cap too!

And a fine basic UV filter that minimally impacts your main filter/camera yet protect them all the same.

All for an affordable price. I find no faults in this kit.

No issues with lens filter. Works as it should. Very clean and high quality. Screws on very well to my third part Fuji lens!

I only really needed the filter to use as a protective layer to the lens.. but it also comes with a lens cap, string strap for the lens cap, and a cleaning cloth! Always need more new cleaning cloths! I don't need the lens cap, but it's good to know I have an extra one now incase i lose my old one.

I've been using many K&F filters in the past and I have no issue with their filter.
This one is also perfect for 49mm lens. UV filter I use is to protect the lens, and this does good job.
No image distortion has been noticed.
Highly recommend for good lens protection.