The filter work on my Sigma lens with 77mm filter thread.
CLP and ND filters works very well with the lens. No image distortion and I didn't noticed any color shift.
More contrast on photo.
VND filter is very convenient.
Light and easy to use.
CLP and ND filters works very well with the lens. No image distortion and I didn't noticed any color shift.
More contrast on photo.
VND filter is very convenient.
Light and easy to use.
16/10/2025
This filter is a must have. Quality wise, it is extremely well made. It fits perfectly and securely. Photo wise, this genuinely elevates your art to the next level. Absolutely, completely worth every penny and then some.
15/10/2025
I ordered one of these as well as a nano-x series. I think the k-series is great bang for the buck. I did not notice a difference in image quality. The k-series comes in a plastic clamshell in the cardboard box (vs a fake leather carry case for the nano-x) and the k also has less lens coatings. If you really need those coatings, by all means get the nano-x. But if you just want a straigh-up polarizer/ND/diffuser this is great.
Be aware you can't use a lens hood with this due to the adjustment knob, and you also can't mount other filters in front of it or even put your lens cap on the front. It is a very specific use case filter that you'll put on when you need and then take off.
The polarizer and ND work together in such a way that you will need to set ND first, then screw down the adjustment knob to lock it in place, than set your polarizer where you want it.
This filter was still a touch too thick to use with my Sony FE 24-105 G OSS without causing some minor vignetting, but stepping up to an 82mm seems to be fine.
Be aware you can't use a lens hood with this due to the adjustment knob, and you also can't mount other filters in front of it or even put your lens cap on the front. It is a very specific use case filter that you'll put on when you need and then take off.
The polarizer and ND work together in such a way that you will need to set ND first, then screw down the adjustment knob to lock it in place, than set your polarizer where you want it.
This filter was still a touch too thick to use with my Sony FE 24-105 G OSS without causing some minor vignetting, but stepping up to an 82mm seems to be fine.
14/10/2025
The K&F Concept 77mm Black Diffusion Mist Effect 1/4 & Variable ND2-32(1-5 Stops) & Circular Polarizing Filter is a fantastic filter to have on hand. This is part of the K series of the K&F Concept filter line. K&F came on the scene a few years back with the K- Series, Nano X and Nano X Pro series of filters. And these filters are excellent in optical and mechanical quality. They give the big names, a major run for their money. I was one of those guys that spent hundreds of dollars per filter. Now I use the K- Series and Nano X Pro filters on all of my lenses. And when it comes to polarizer, neutral densities, black mist or light pollution, you can't go wrong with these filters. This filter has 18 multi coated layers. And has a precision machine holder. The rotation of the filter is smooth and fluid. This combo filter has a locking knob and is a nice feature. There is no detectable added glare or flaring. As I said, I run these filters on all my lenses, including my Canon L and Z lens. I highly recommend these filters and would not hesitate purchasing one.
13/10/2025
This is such a clever item! I have been loving my filters from this company and this is another awesome addition to the lineup!
I haven't been able to extensively test this item since it's ideally meant for sunny days, which are sorely lacking in Ohio right now. However, playing around in my backyard on the few moments of sun we've been getting and I've really been loving the way this sucker works.
It does take a bit of finesse to sort out how to make it sing but it's pretty awesome once you narrow it in.
This will be magical to take on vacation!!
I haven't been able to extensively test this item since it's ideally meant for sunny days, which are sorely lacking in Ohio right now. However, playing around in my backyard on the few moments of sun we've been getting and I've really been loving the way this sucker works.
It does take a bit of finesse to sort out how to make it sing but it's pretty awesome once you narrow it in.
This will be magical to take on vacation!!
12/10/2025
I recently added the K&F Concept 77mm Black Diffusion 1/4 Filter to my Canon EF 24-70mm lens, and it’s been a delightful surprise. This filter softens highlights and reduces contrast, giving my photos a dreamy, cinematic quality. It’s like adding a touch of nostalgia to modern shots. The build quality is solid, with an aviation-grade aluminum frame that’s slim yet sturdy, and the threads screw on smoothly without any binding. It feels just as premium as other K&F filters I’ve used. If I had to nitpick, it’s a tad heavier than expected, but that’s a small trade-off for the convenience it provides. Overall, it’s a fantastic addition to my photography gear.
11/10/2025
Great combination filter that is a lot more convenient to use than stacking a CPL and ND on your lens. These sorts of filters are of course not meant to live 24/7 on your lens, nor should you expect your hood to fit (besides, that would block the ability to adjust the filters, this one or any such adjustable type).
Optics are top notch, with minimal vignetting noticed (and easily adjusted in post).
Optics are top notch, with minimal vignetting noticed (and easily adjusted in post).
10/10/2025
I figured having 3 filters in 1 would lead to none of the effects being particularly good, but in use, it actually works really well. I like that the ND filter is adjustable which makes it more versatile, the polarizer works effecively without introducing color shift and the black mist filter gives a pleasingly soft image. Build quality is good, I don't have any complaints with it; it threads on smoothly and the ND rotates easily. It worked a lot better than I was expecting it to and at least to me, seems equal to stand alone filters of each type. I think it's a pretty solid value and a good all-in-one filter overall.
09/10/2025
This is a combination of a black diffusion filter, a 1 to 5 stop variable neutral density filter, and a standard circular polarizer. As such, it does what it would normally take separate stacked filters to do. It's a versatile, do-it-all filter.
Quality is good, with smooth turning rings and easy to mount threads. Three microfiber cloths are included in the plastic clamshell case (not sized to the filter, which just rattles around in the case).
There are some downsides:
1) There are no threads on the outside of the filter, so another filter or lens cap cannot be added on top of this one.
2) The adjustment knob prevents the addition of a lens shade (almost a deal breaker for me), and the knob is not removable.
3) Turning the variable ND filter can be difficult.
Some photographers prefer a 1/8 diffusion filter to this 1/4 version, but I like the increased diffusion it affords.
Quality is good, with smooth turning rings and easy to mount threads. Three microfiber cloths are included in the plastic clamshell case (not sized to the filter, which just rattles around in the case).
There are some downsides:
1) There are no threads on the outside of the filter, so another filter or lens cap cannot be added on top of this one.
2) The adjustment knob prevents the addition of a lens shade (almost a deal breaker for me), and the knob is not removable.
3) Turning the variable ND filter can be difficult.
Some photographers prefer a 1/8 diffusion filter to this 1/4 version, but I like the increased diffusion it affords.
08/10/2025
K&F continues to amaze and produce excellent photography accessories and gear. This variable ND filter provides crisp and clear images. The filter itself is perfect. The only thing I would change would be to add a small foam pad inside the provided plastic case as has been in other K&F filters I own, but that is easy enough to cut out and insert myself.
07/10/2025