77mm Variable ND Filter ND2-ND400 (1-9 Stop) Lens Filter Waterproof Scratch Resistant Nano-X Series

SKU: KF01.1465

Will this work for a zoom lens at both 70mm zoomed out and 200mm zoomed in? The cheaper K&F filter was very blurry at 200mm for a Nikon 70-200mm 2.8.
Answer Question
Hi, this is our Nano-X series filter, with 28 multi-coating, high definition, the largest focal length without vignetting is 16mm, thanks.