No, the ND filter in the magnetic set is an ND1000 (extends the shutter speed by a factor of 1000). However, it would be technically difficult to construct a magnetic, yet adjustable ND filter. 

First, K&F Concept ND2-ND400 lens filter allows changing shutter speed based on the effect you want with the best sensibility and the same aperture. Second, K&F Concept ND2-ND400 lens filter allows creating a blurred background with a large aperture while the shutter speed remains the same. Third, K&F Concept ND2-ND400 lens filter is designed to prevent overexposure and maintain image purity and quality at the same time. *Like a zoom lens, the variable nd filters are suitable for multiple shooting situations. If you're looking for perfect image quality, a fixed ND filter is recommended. 

This issue could be improved according to following suggestions:

1. Q1: Camera shutter does not release when lens is attached
   A：The lens is fully manual and does not have electrical contacts. Please switch your camera to "M" (manual) mode
2. Q2: Images are too dark
   A：Lower the f-stop on the lens, and/or lower shutter speed, and/or raise ISO settings on camera
3. Q3: Images are too bright
   A：Raise the f-stop on the lens, and/or raise shutter speed, and/or raise ISO settings on camera
4. Q4: Images are not coming out in focus
   A：a) Adjust the focusing distance on the lens to the correct distance.
   b) In certain photographic situations, you may find it easier to focus at f/5.6-8 rather than f/3.5

 

Read speed is 95 MB/s. Write speed is 30 MB/s. 

With this filter, I can reduce my shutter speed, even with a sunny day, so in my photos I get a blur motion background. Same thing with video, you can reduce the shutter speed so you will get more motion blur. It you consider for portrait, this filter don’t add blur background. For that you need a 2.8 or faster lens. I hope this help