I have other K+F filters for other lenses and they have been exceptional. I ordered this duo for the Sigma APS-C 18-50mm F2.8 zoom I use on my Sony A6000. When I stack both filters together, there are severe black corners. When I zoom from 18 mm to 19.5 mm, they are gone. If I use one filter at a time, no problem. So I decided to leave the polarizer on for the summer and reinstall the UV in the fall. Unless I plan to shoot 20-50mm on a given day. These filter rims are so thin that I don't think there is anything on the market that could improve this situation. I have put K&F on other lenses with no problems. Must be just this Sigma lens design.

Anyone who likes photography knows what you use an ND filter for. Since my attention is the landscape photography I can not avoid working with such filters. I ordered this one from K&F for my full frame camera.

I was just tired of filling my backpack with ND filters of different strengths. So the Nano-X Pro came in handy. To use it on several lenses I ordered it in the size 77 mm. I then work with step up rings to be able to use it on smaller lenses.

To say it right away: The optical quality and the quality of the images has flashed me! The workmanship is excellent and very successful. The lens thread is top clean cut.
The filter is adjustable from ND 2 to ND 32. The larger steps (f stops) are marked on the ring and easy to read. It can also only be turned in this range of 1-5. Below or above it does not work. So you always know by the stop what you have set.

The 77 mm. Ring brings 93 gr. on my kitchen scales. Everything is solid and feels very good. The setting runs well with slight resistance. So it should be.

The optical quality is absolutely flawless and even in difficult lighting conditions the filter delivers top. Chromatic aberration or color gradients into the green, magenta or anywhere else I have not been able to determine even when pixel peeping. Even with foliage or firs in backlight and with reflections from dew, the quality of the filter is unsurpassed. Finally a ND filter that does justice to my limited lenses and the full-frame sensor. The frame thickness with thread is only 9 mm. Without thread 0.63 mm. So you can use the filter on wide angle lenses without edge shading.

Thanks to the two screwed brass handles and the ribbing of the ring, the filter can be adjusted very sensitively.

Conclusion:
K&F Concept has delivered a top filter here. What good is it if you put thousands into lenses but then bad filters make the work difficult or lead to lousy results? From me clear 5 stars+. I hope this is useful for your purchase decision. Also the price is relative because you save at least 4 ND filters.

In order to be able to use a filter on several lenses, I bought 2 different adapter rings (72-77 mm and 62-77 mm). I'm thrilled that attaching and detaching is unproblematic and fits well on the lenses. The feel is excellent. The grooves make it very easy to feel where the adapter ring ends and where the polarizing filter can be rotated. The material is high quality and well made. thumbs up for that.

I bought this adapter to use Sony A-mount lenses from my Alpha 58 on the BlackMagic Cinema Micro. Am very happy with it. Nothing wobbles and there is no play. The wide-angle kit lens fits perfectly and the vignetting is not noticeable (logical! APS-C sensor of the Sony is larger than the 16 mm sensor of the BlackMagic). Lenses with a fixed focal length of 35 and 50 mm fit just as well. The only thing I haven't tried is the 50-200 zoom lens, but only because I don't plan on filming with it. Overall I am very satisfied and can recommend it. Of course, it has no electrical connection to the lens, so you can't use LANC to control the focus. But that should be obvious anyway given the low price. For such tasks you use active MFT lenses or a booster, but I haven't seen any speed boosters for A-mount yet.

Anyone who likes to take photos knows what an ND filter is used for. Since my focus is landscape photography, I can't avoid working with such filters. I ordered this from K&F for my full-frame camera. I was just fed up with always filling my backpack with ND filters of different strengths. The Nano-X Pro was just what I needed. In order to use it on several lenses, I have it in the size 77 mm. ordered. I then work with step-up rings so that I can also use it on smaller lenses. To put it bluntly: I was impressed by the optical quality and the quality of the images! The processing is excellent and very successful. The lens thread is very cleanly cut. The filter can be adjusted from ND 2 to ND 32. The larger steps (f-stops) are marked on the ring and are easy to read. It can also only be rotated in this range from 1-5. It doesn't go below or above. So you always know what you have set by the stop. The 77 mm. Ring weighs 93 grams on my kitchen scale. Everything is massive and feels very good. The adjustment runs well with slight resistance. That's how it should be. The optical quality is absolutely error-free and the filter delivers top quality even in difficult lighting conditions. I did not notice any chromatic aberration or color gradients into green, magenta or anywhere else with pixel peeping. The quality of the filter is unsurpassed even with foliage or fir trees against the light and with reflections from dew. Finally an ND filter that does justice to my limited lenses and the full-frame sensor. The frame thickness with thread is only 9 mm. Without thread 0.63 mm. This means that the filter can also be used on wide-angle lenses without edge shadowing. Thanks to the two screwed brass handles and the ribbing of the ring, the filter can be adjusted very sensitively. Conclusion: K&F Concept has delivered a top filter here. What good is it if you put thousands into lenses and then bad filters make the job difficult or lead to lousy results? Clear 5 stars+ from me. I hope this is useful for your purchase decision. The price is also put into perspective because you save at least 4 ND filters. Thanks to the two screwed brass handles and the ribbing of the ring, the filter can be adjusted very sensitively. Conclusion: K&F Concept has delivered a top filter here. What good is it if you put thousands into lenses and then bad filters make the job difficult or lead to lousy results? Clear 5 stars+ from me. I hope this is useful for your purchase decision. The price is also put into perspective because you save at least 4 ND filters. Thanks to the two screwed brass handles and the ribbing of the ring, the filter can be adjusted very sensitively. Conclusion: K&F Concept has delivered a top filter here. What good is it if you put thousands into lenses and then bad filters make the job difficult or lead to lousy results? Clear 5 stars+ from me. I hope this is useful for your purchase decision. The price is also put into perspective because you save at least 4 ND filters.

After having had good experiences with the Yonguo 50 mm, I also tried the 35 mm for my "second system" with the Canon M10. It's always a surprise how good these "cheap" lenses are. With an open aperture, the 35 has sufficient sharpness in the middle, which does not diminish at the edges either. The bokeh is nice and even. A little stopped down (F 2.5) it gets even sharper. The small minimum distance of 25 cm is pleasant. Of course you have to make compromises. The autofocus is loud and not as fast as a lens that is 5 to 10 times more expensive. On the other hand, it is quite reliable (not a problem on the M10) even in low light. The processing is good. It's plastic, but feels sturdy. And it's easy. In any case, it can remain as a fast normal focal length on APS-C.

This is a diffusion filter for 67 mm filter diameter lenses. The filter is very special in its own way.
If the exposure is correct, you get an interesting picture in many situations. Almost dreamy and foggy. In this way, completely different moods can be captured. Both as a video and as a photo.
However, you have to keep in mind that the image is slightly less sharp as a result. But that just fits the look.
The filter itself is well made and of good quality.
I also think the price is reasonable.

Anyone who enjoys photography knows what to use an ND filter for. Since my focus is on landscape photography, I can't avoid working with such filters. I ordered this from K&F for my full frame camera.

I just got tired of stuffing my backpack with ND filters of different strengths. That's where the Nano-X Pro came in. In order to use it on several lenses I ordered it in the size 77 mm. I then work with step rings to be able to use it on smaller lenses.

To say it straight away: the optical quality and the quality of the pictures flashed me! The processing is excellent and very successful. The lens thread is cut very cleanly.
The filter can be adjusted from ND 2 to ND 32. The larger levels (apertures) are marked on the ring and are easy to read. It can also only be rotated in this range from 1-5. It doesn't go below or above. So you always know what you have set at the stop.

The 77mm. Ring brings 93 gr. on my kitchen scale. Everything is solid and feels very good. The adjustment goes well with slight resistance. It should be so.

The optical quality is absolutely flawless and the filter delivers top quality even in difficult lighting conditions. I could not determine any chromatic aberrations or color gradients into green, magenta or anywhere else during pixel peeping. The quality of the filter is unsurpassed, even with backlit foliage or fir trees and reflections from dew. Finally an ND filter that does justice to my limited lenses and full frame sensor. The frame thickness with thread is only 9 mm. Without thread 0.63 mm. So you can also use the filter on wide-angle lenses without edge shadowing.

Thanks to the two screwed brass handles and the ribbing of the ring, the filter can be adjusted very sensitively.

Conclusion:
K&F Concept has delivered a top filter here. What's the point if you put thousands in lenses and then bad filters make the job difficult or give lousy results? Clear 5 stars+ from me. I hope this is helpful in your purchase decision. The price is also relative because you save at least 4 ND filters.