No complaints. The filter seems to be well built, the case it ships in is ideal for storage in my camera bag. The resulting image is also good.
28.12.2019
I bought this thinking it would save me time taking my neutral polariser off one lens and transferring to another. This was a huge mistake. The vari works well but moves too easily making adjustments and keeping the shot settings almost impossible. Autofocus spent ages hunting for the subject and could not lock on, tried manual focus with little improvement but still out of focus pictures. an other wasted purchase IMHO. The none setting on the polariser has a .2 shade to it.
14.11.2019
First variable ND filter purchased (all others I have had have been static) and what a difference it makes!So easy to move around, and not having to carry more than one per lens is a real space-saver in the bag!I've experienced no false colour or the infamous X on any images (although I don't use this all the way closed!)Comparing it to a friends premium ND (I won't mention the brand), I could not see a difference at all in image quality. However, the premium ND was a bit stiffer to move around, so it felt like it would stay exactly where left. The K&F one does feel like it may loosen up over time, although this hasn't happened yet a few months in!
28.03.2019
08.10.2018