First, the K&F Concept ND2-ND400 lens filter allows you to change the shutter speed based on the desired effect with the best sensitivity and the same aperture. Second, the K&F Concept ND2-ND400 lens filter allows you to create a blurred background with a large aperture while keeping the shutter speed the same. Third, K&F Concept's ND2-ND400 lens filter is designed to prevent overexposure while maintaining image purity and quality. *Like a zoom lens, the variable final filters are suitable for multiple shooting situations. If you are looking for perfect image quality, a fixed ND filter is recommended. 

To avoid dark corners, K&F Concept ND2-ND400 filters are designed in ultra-wide construction, so that the front of the ND filter is one size larger than the camera lens. It is recommended to use a larger lens hood. 

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

Yes, the filter has an internal thread, but one size larger 

If the sky is too bright, turn the dark half of the neutral density filter up and vice versa if e.g. B. the lawn is too light, turn the filter down. The best thing to do is test and try it yourself, it can bring a lot when used correctly. 

Tested with Nikon Z 7 and Nikor 14-30mm Sline, dark corners are not obvious for 14mm and no dark corners for 16mm. 

Yes, the 2 in 1 filter is HD imaging. 

Yes you can.. 

When zooming, there is no interference with the filter! 

No, it does not exist