Worth spending the extra money. I've combined this with step up mounts to use this one filter across several lenses.
                                             15.06.2021
                              First time using an ND filter. Really good quality, none of the issues I've read about with cheap ND filters highly recommended
                                             10.11.2020
                              So good i brought 2 as I often have 2 cameras with me when im on shoots, perfect no cross easy to use
                                             15.09.2020
                              Hard work to use as viewing thru the viewfinder is very dark, you could compose your picture wiithout the filter first, but you run the risk of dropping and breaking the filter whilst trying to screw the filter in. In hindsight a drop in filter would be more useful as you could compose first then just drop the filter in to take your shot. The image quality is good and it does the job, the filter is well made and packed complete with a nice storage case to protect whilst not in use I am pleased with it.
                                             22.08.2020
                              I did a lot of research and watching videos etc before buying the K&F veriable ND filter, I wasn't sure this filter would help with 4k video, wow was I so wrong. As you can see in the screen shots from the video, it makes a massive difference. I am very impressed and glad I bought it. Yes I would recommend. Thanks
                                            
                                 18.08.2020
                            Bought this for a recent trip to Rome. Never came off the lens. terrific build quality and performance. worked silky smooth, love it!
                                             26.05.2020
                            I used it on my 17-55 canon 2.8 lens for video. Its amazing! Nice feeling to rotate it, perfect case for transporting included in the box. Does jnot have ‘x’ when used at 8 stops! Doesnt effect image quality. I have a similar just more expensive different brand variable nd and performs not as good as this one. Im a pro cinematografer and i trust this brand!
                                             02.03.2020
                            Works great if starting out with long exposure photography but it does have a little vignetting and colour cast
                                             19.02.2020
                            
	
                            
