hello,you can purchase ND2-ND32 (1-5 Stop) Variable ND Lens Filter. Check here: https://www.kentfaith.com/index.php?route=product/search&search=KF01.1061 

ND2-ND32 filter allows you to reduce 5 steps, ND8-ND2000 is 9 steps, ND8-ND128 is 5 steps. 

K&F Concept ND2-ND400 lens filter controls the amount of the light that enters into camera lens with two sets of polarizing glass of high transparency. 

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. 

K&F Concept ND2-ND400 lens filter controls the amount of the light that enters into camera lens with two sets of polarizing glassof high transparency.