Lee Big Stopper (100x100mm) winding lever the rotating back lets you

the rotating back lets you shoot vertical or horizontal without rotating the whole camera

which is included

But this is an original Calypso

Unable to source more of this rubberized black cloth

and they did a heck of a job: along with a very heavy brass body in a grippy matte finish

Lee Big Stopper (100x100mm) winding lever the rotating back lets youThe Lee Big Stopper is a 10 stop ND filter designed to fit a 100x100mm Lee filter holder or compatible. Neutral, high quality glass and a foam pad to prevent light leaks a well designed filter for long exposures. Requires a compatible filter holder (not included). In excellent condition, with carrying tin.