After laboratory testing, it can be guaranteed that there is no vignetting at the 16mm end when using the Nikon Z 7 with the Nikor 14-30mm Sline. 

This UV filter frame was made by aviation aluminum. 

Hello, we don't sell screen protectors, this watch's screen size is 1.69 inch, you can find them in the market according to this size. ^-^ 

I've never used Hoya ND's, but I have GOBE, KERNEL, ZOMEI, and K&F ND filters. Out of all of them, I like the K&F the most because the colors look great out of the camera and they don't create a vignette around the edges like some of my other nd's which I hate. Because of the great out of camera colors, it gives you more to work with on post-production when you shoot on a flat profile. Also, I've used them during night photography on bulb mode to do light painting and the 4 - 6 stop ones work great for this. Overall, I think for the money the K&F filters are worth it. Awesome product! 

Hi, the K&F black soft filter 1/4 has the same effect as Tiffen black pro-mist filter 1/4, just difference in name , thanks.