I've acquired several K&F Concept products over the last couple of years and they've all performed well for me at the price. This filter is no exception. Granted I've not used polarizers or ND much so I'm a novice at knowing what the difference between a good and great example is. I can say that I see no defects in the output. The ND reduces light uniformly and the polarizer cuts glare as I expect. I don't see any variances in the output picture.
If this item has the feature set you need and you like the price, I believe this K&F Concept combo filter will serve well. Best luck.
~Cheers!
If this item has the feature set you need and you like the price, I believe this K&F Concept combo filter will serve well. Best luck.
~Cheers!
19/03/2026
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.
18/03/2026
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. 
14/03/2026
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.
12/03/2026
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!!
11/03/2026
I have a few other diffusion/ ND combo filters but this one is probably the most versatile of the bunch, the inclusion of a CPL filter on this specific filter is a game changer for some scenarios. Specifically, if you're filming outside and want to cut through atmospheric haze, remove reflections from pools of water or film from the outside through a car window. All this while combined with a diffusion filter and a VND to help you control light, maintain a constant shutter speed and a nice cinematic bloom effect to your images. Overall, it's super versatile and if you're looking for a nice all in one filter to drop into your kit, this is one you should consider.
05/03/2026
Love the quality of this filter. An excellent brand with a quality product that is affordable and reliable. Easy setup to your lens and simple adjustments. A must have for photographers and videographers alike. Brilliant!
03/03/2026
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.
01/03/2026
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.
28/02/2026