regularly go out into nature with my dog and carry my Nikon D750 with various lenses, the most important of which all have a 77 mm thread. Especially in the forest and in the Harz Mountains, I always use a polarizing filter to reduce reflections from leaves and water. The only problem is that polarizing filters always absorb light and you have to extend the exposure time accordingly, which is a disadvantage if I want to take spontaneous photos of my dog. Up until now, I was skeptical about magnetic filters because I was unsure whether they would hold well enough when I was hiking through nature with the camera and the filter mounted. Accordingly, I welcomed the opportunity to test this filter from K&F as part of the Vine program. I have already had very good experiences with K&F products. Your program covers a very broad spectrum, but there are some of your products that are very high quality, but are aimed at ambitious amateur photographers precisely because of the lower prices. This filter is also one of the better products, which you notice as soon as you unpack it. The filter is very cleanly made, the magnetic thread and filter fit perfectly. The filter comes in a matching box, and there is also a lens cloth included, which is well protected in aluminum packaging. Overall, everything makes a very good impression. The thread can be easily screwed onto the lens, the magnet pulls the filter well into position and holds it very firmly, so that the filter can be easily rotated without slipping out of position. Since this is a slim design, it hardly affects the image even with the wide-angle lens at 16 mm. This filter has clearly put to rest my fear that a magnetic filter could fall off while hiking. It sits really securely and firmly on the lens. Nevertheless, it can be removed very quickly if necessary, which is much more convenient than the tedious unscrewing. For me, this is a significant improvement in the handling of filters in outdoor photography, where you often have to adjust your equipment spontaneously. I think I will now rely more on using magnetic filters, the test convinced me of their functionality. The filter performance is clearly in the better range of the polarizing filters that I use. There are really big differences in the reduction of reflections and color fastness, and you have to invest quite a bit if you want to have reliably good filter performance. I am very satisfied with the performance of this filter; you can clearly see how reflections are reduced when you turn it. Overall, this is another highly recommended product from K&F.