Before every business trip I try to upgrade my gear.I already have a number of fixed ND filters for video however every so often, you want to have some flexibility or "just in case." As such, I picked up this variable ND filter from K&F.Overall impressions are quite good .The filter feels solid, there were no imperfections on the glass upon delivery and it came packaged well in its own case. This filter case is slightly bigger than the one I picked up with my CPL filter from K&F.The filter screwed on and off the lens with no issues and functioned smoothly, changing from low to high (ND8 to ND2000). This is a free moving ND filter so there are no bump stops, etc. Dial it in to what you have. The filter, as you can see in the pictures does come with easy to see markings.The only things to be aware of, and this is my first variable ND filter... while my fixed Hoya ND filters easily functioned with the lens sun shade, the variable ND filter is a bit thicker. In any case I suppose you would not be able to adjust it if the hood was on, unless you have a cut out in your sun shade.Overall, good filter, and while it is not cheap junk sub $20... it is certainly not going to burn a hole in your wallet.3 year warranty is a plus.