I like this UV filter, and im an amateur photographer if there is any decrease in image quality I don’t see it and if there is a hue change it isn’t a lot. It does come with a wiping cloth and a lens cap with a wrist rest. But the cap was worse at grabbing the filters then the stock cap that came with my lens.

I got this filter to protect my lens from drops and objects getting on the lens and then me scratching it when removing the dust and this give me another barrier of water protection since the lens I use it on is the Canon EF 16-35 f4, and with it being an internal zooming lens but there is nothing blocking anything from the front end when it moves and stuff can get in there.

I love the protection and quality of this for my nature and wildlife photography, I also do portraiture work. I have the older version of this lens filters the HD version on my other lenses and this keeps up with them. It seems like a direct replacement of the HD K&F slim UV filters they are the same size.

This does have water repellant coating and other coating with a green hue on light reflection when looking directly at the filter. So it has some coatings on it for anti scratching and stuff, but its not the best ever.

I do have some issues when I put another filter on the end and then the uv getting stuck to that other filter. But I don’t know any screw on filters that don’t have that issue. Maybe if you spend like 80 dollars+ on the top of the line UV filters might be better but your best bet would be to get magnetic filters.

Speaking of the expansive filters I rather recommend these filters for normal people or if you are worried about the 2-5 percent sharpness drop then go all out and get K&F Nano-x pro series. This will be the best K&F has, that I have seen. I personally will upgrade to the nano-x but the money is a big thing. Once I start making more money doing this I’ll go all out but for now these work great and I will keep using them.

Final thought TLDR
I like these filters and will continue to use them they are affordable and work great. I recommend these to any photographers looking for a uv filter on a budget.

I got this to protect the lense. Provides good clarity

I own quite a few filters (UV, ND & CPL) and other products from K&F. This UV filter came in a square plastic case with a lens cap and lens keeper. The filter was clean out of the box. I got this filter for my Nikon 20mm f2.8D lens. So far, I was using the lens without a filter but got one to protect the lens front element when shooting outdoors. Both the K&F or the OEM lens cap fits well over the filter.

I do not use a filter when shooting indoors. Even outdoors, I tend to use one when shooting in dusty environments and only on lenses that do not have a hood. It is a piece of extra glass that we put over the lens, it will have some minor imperfections which may be visible if one is a pixel peeper.

This filter is good, I did not notice any degradation in image quality on pictures I have shot so far. Even though I do not use it indoors, I took some pictures to test, and did not notice any differences with or without a filter.

The lens cap is ok but not as good as the OEM cap. The pinch is not deep and does not provide a good grip. The lens cap keeper is a waste, I cannot tighten it over the lens barrel and so won’t be using it.

For $10.99, nothing to complain about, this is a good filter with lens cap, helps protect the lens against dust, scratches and fingerprints.

I own a Panasonic Lumix G85 camera that came with a 12-60mm F3.5-5.6 lens. I really like both the camera and the lens—they're compact, and the lens is excellent. Since I occasionally take outdoor shots and make videos, I ordered the K&F Concept UV filter for those situations and to protect my lens.

The filter arrived quickly, and out of the packaging, I received the UV filter, a lens cap, and a lanyard. Installing it on my camera's lens was very easy, and I can already see an improvement in my photos and videos. Overall, I think this is a must-have accessory for the G85 with the kit lens, and I highly recommend it.

I got a cage for my new GoPro 12 which allows for conventional 52mm camera filters. Normally, you have to get the funky square filters for the action cameras, so being able to use filters I already own is pretty cool. But I didn't have a good UV filter that wasn't already being used on my normal camera lenses, so I got this filter and it's working out well, and I appreciate the inclusion of a lens cap.

The only negative to this filter when used on a GoPro cage is I do get a small amount of vignetting when at the camera's widest setting, "Hyperview"., It's rare I use hyperview, so no big deal, but it's worth noting that this thin-ish filter may not be thin enough if you're using this on a super wide lens.

Other than my minor issue that is probably only an issue when used with a GoPro, I can find no other faults. If nothing else, I've added one more layer of security to my expensive action cam.

The filter itself has good transparency with the coating, the lens cap is actually quite useful extra that helps when I misplace original cap.

This is a very nice cost effective UV Protective Ultra Slim Filter. It's slim design it what I was looking for to protect my new Nikkor Z Series 24 -120mm F4S 77mm. The slim 3mm in depth will avoid vignetting on wide angle at 24mm. This filter has a Nano K Multi-coated glass that should help blocks and prevents the harmful effect of UV rays and glare but more importantly will help protect the front of my new lens from dust, scratches and possible hits.

It's a nice aluminum frame with a CNC machined edge on other side to help in install and remove the UV Filter. With the double threaded filter, it will help screw on a polarizer filter with ease. You also get a great matching Lens Cap with the K&F signature Logo in front of the cap which is fantastic, you can always use an extra lens cap.

The prices for this inexpensive 77mm UV Protective Filter by K&F Concept with a lens cap is a great value to protect your lens. It's well made, good quality glass used, I have no issues with fit and threading, clarity or vignetting. This is another great product by K&F Concept.

I usually have a filter on each of my lenses, because I like photography in general and Motor Sport in particular, so the protection provided by a filter never hurts, apart from its benefits in improving contrasts and reflections.

As always at K&F, the presentation of 10, a silver cardboard box completely screen-printed inside a rigid PVC box, perfectly protecting the product. Inside that box we find the filter, a protective cap, a fastening strap for the lid and a single-use microfiber suede.

As for the filter, two things struck me, how thin the filter frame is and how well constructed it is to be in the “low” range of the brand.

Once installed, the filter is invaluable when viewing the photos thanks to its optical quality, even as a good UV filter, it suppresses certain flashes and slightly clarifies the mists, which is to be appreciated.

As for the construction, its metal frame with two wavy areas, apart from threading perfectly into the lens, thanks to the corrugations it is very comfortable to put on and take off.

As for a K&F product, I didn't expect to be disappointed, but we're not looking at the manufacturer's top range, but as always, my expectations improve.

The additional cover with adjustable strap seems to me to be very comfortable and a good thing to incorporate it, as well as a cleaning cloth for the first placement of the filter.

Personally, I have never used UV filters on my lenses until now, I have always seen them as protection, but at the same time capable of “worsening” the quality of the images more or less (being in any case an extra glass).
To state that I am not a professional (with all that comes with it), I chose a Ø77 filter so as to be able to at least protect the lens with the largest Ø that I have at the moment.
I've taken it with me in recent releases and honestly I haven't noticed any loss of quality (at first I did some tests with and without a filter), so I decided to leave it mounted, at least when shooting outside.
The filter is however very thin and can be installed without problems.
I don't like the included cap very much, it attaches well but I feel it's less stable than the original Sigma lens cap. Good to have in stock anyway.
The quality/price ratio is excellent, if only to be used as protection for slightly larger lenses.

This glass is purely for protection for my lens. There is no perceptible distortion or light loss. You don’t need to spend $80 for the premium filter. The difference is negligible if there even a difference. Save you money for your next lens. That is where the smart money goes.