This is a TEST REVIEW for the item sold on Amazon with the description: K&F Concept Nano-K Magnetic Filter, CPL Circular Polarizing Filter with Nano Coating for 77mm Lens (Cleaning Cloth Included). This is a CPL filter (polarized light is controlled by rotation around its axis) that is very comfortable to use thanks to its two-part threaded anchor ring and the filter with magnetic outer ring. The threaded ring is installed and then it can be removed with a simple grip and pull on its contour (which has a ribbed texture for a better grip) and to fix it again, then present it on the ring and position it until you find the magnetic pull and its anchor in a well-adjusted position. In terms of performance, they stand out outdoors in good sunlight (indoors and artificial light is imperceptible) and outdoors very shady. Therefore, it is usually useful when shooting landscapes, especially in areas where an area of sky or clouds appears, or where light is reflected in rivers, springs, lakes, etc... or in reflections with a metallic effect. Depending on the orientation in which the ring is rotated, the image becomes slightly darker or brighter, attenuating the sunlight and taking on a greater or lower color saturation (when rotated on the magnetic system it sounds a little like a rubbing squeak, but as is usually used in photo and video recordings, the position is first sought and then the recording is activated, as this does not affect the tone of the recordings). I made an edited video with some image changes in the same shots, with the CPL polarization ring only partially rotated. The images appear with a higher hue but less luminous, which is why it is advisable to adjust the gain of the light meter a little, because if we rotate the ring when we are in manual mode or in the preferred aperture or speed control modes with respect to it, the recording speeds and apertures vary respectively, and personally I like images that are a little more vivid both in colors and brightness, but without annoying reflections. Due to its very good price/quality ratio and its ease of installation and replacement with filters from the same “Magnetic Adapter Ring” magnetic attachment ring system, its thin “Slim” mount that prevents vignetting on square lenses, its good presentation in a protective box and the special cleaning cloth included in the set, my rating for this K&F Concept filter is: “5 STARS” = [* * * * * *]. I hope you find this review helpful, Best regards. The disadvantage that I forgot and that I noticed later is that on CANON lenses with the EF series front caps, they do not attach with the filter installed or with the filter removed, since the filter is a narrow format (SLIM), the retaining tabs of the lens front cover do not engage with the profile of the filter or its support ring. To be able to put the cap on, you must also remove the threaded ring and store the set in the box.

Smooth and stable. Great for live streaming.

Got this light mainly as a curiosity and as a possible backup streaming light. Ended up loving it! The color and brightness options are great and it lasts a good while. We ended up using the magnetic back to temporarily mount it in a couple areas. The magnet could be a bit stronger tho, only works upside down. If placed vertically it tends to slide down and not really stay put. Some more buttons and saved colors would be handy, cycling though all the options can be a bit frustrating.

Material and quality is perfect and working excellent, I’m using for live streaming at studio

First impressions: - good looking - fine workmanship - matte interior finish (light doesn't jump in) - smooth conformance to camera body - smooth shift rotating One ring - comes in an unsealed hard case and nothing else on it - out of the box with any vintage Nikon mount usable lenses - orange ring gives the looks to the whole camera setup - the adapter fits harder on the lenses (needs to be attached) - focus is based more on the depth of field (FOD) difference in the picture frame - it works more like zone focusing and precession focus zones are heavy to reach - metal mount on lens side and (I think it's still a metal) black plastic which looks nice, camera charcoal mount (it's passive adapter and therefore no electrical communication between lens and camera) - light doesn't get through the adapter into the Barrel (sealed fit) - it should come with end caps to the adapter to keep dust out when not in use - for the money I paid I like experimenting with my old lenses on the Sony mirrorless body

I like the selfie ring light, only issue max brightness is not that bright but it is good.Also, the buttons to control the light need to be closer to base rather than hanging in the middle of power cable.

It is a simple ring light that meets the purpose. The quality is ordinary but still recommend given the good price.

When you open the incoming package, you will find that the packaging is very high quality. The brand is very careful in presenting their products and the materials are of high quality. The filter holder and adapter ring are metal and the filter holder has a spongy area whose function is to seal with the filter without letting light through. Once the filter holder is attached, it is easy to move. crtsal 100x100 quality is very good, with highly polished edges. The filter holder has two slots for square filters, but the advantage is that the ring screwed on the lens can be screwed with another round filter, for example a polarizing filter. I think the picture is very good. As with the brand's round filter, the sharpness is not lost, the color cast did not catch my eye, anything that can be edited during development is appreciated. The ND1000 filter included in the kit enables long exposures in strong light. The sample photos are photos taken on a cloudy afternoon with and without a filter. Those with filters were made with an exposure time of 20 seconds.