H&Y Filters ND400 (9 Stop) Magnetic Clip-On Filter for RevoRing (58-77mm) Swift Bridge Rings (B) The band of density extends

The band of density extends toward the top and bottom of the filter before tapering to clear areas that extend to the top and bottom edges of the filter

and Black Mist versions)

It allows B Module and C Module accessories to be added to a lens with a 77mm filter thread and is compatible with wide-angle lenses

I took the opinions of the site who have wiped many lenses and arrived at the release

H&Y Filters ND400 (9 Stop) Magnetic Clip-On Filter for RevoRing (58-77mm) Swift Bridge Rings (B) The band of density extendsH&Y Filters ND400 (8. 5 Stop) Magnetic Clip On Filter for RevoRing (58 77mm) Key Features ND400 (8. 5 Stop) 2. 7 Optical Density Double Sided 9 Layer Multicoating Water Repellent Resistance Coating 2mm Thick Optical Glass Fits Select 58 77mm RevoRing Products Darkens Entire Image Area Allows Reduced Shutter Speed Allows Wider Aperture Magnetic Frame H&Y Magnetic ND Clip on Filter is designed as a cross polarization cure for wide or ultra wide angle