The cover cannot be installed. In order to avoid the problem of vignetting, the filter specifically increases the aperture of clear light, and the outer diameter of the frame is also increased. 

Yes, the 2 in 1 filter is HD imaging. 

The frame is made of brass material with ultra-thin design. 

By design, we can avoid vignetting when using this filter on non-wide angle lenses, but it may still occur if your focal length is less than 24mm. 

All variable ND filters have this problem: the longer the focal length used, the less the cross shadow will be affected. In the large light reduction gear, cross shadow and vignetting will obviously appear. If you continue to rotate, the shadows will disappear naturally. This is a physical phenomenon, not a product problem. 

Hello, the VND filter is adjustable to 5 stops. 

Hi,please buy the 95mm lens cap. https://www.kentfaith.co.uk/index.php?route=product/search&search=KF04.076 

hello, lens cap should be 86mm 

Hello,put on the CPL filter or mist filter then screw on the Variable ND on top.Stacking filters in general can create different effects and bring out your creativity. The only caution is that as you put more filters on the lens you can create vignetting or the cutting off of the corners of your picture. This can happen more with wide angle lenses. You’ll also get vignetting by stacking neutral density filters, depending upon which ones you stack and the order you stack them you’ll get varied effects. We don’t recommend stacking a VND filter but if you do, make it the last one because of the threads. 

About 375g