>Do they have a fair amount of neutral density, too? Just curious; I
>doubt I'll ever work with one.
Right. I doubt any of us "regular" photographers will work with one but of the
nuclear bomb explosion photographs many were made with just such a shutter.
Inherent neutral density when they were supposed to be totally transmissive did
not really matter. Also they have a significant transmission (well, this is
also relative in terms of application) when they are supposed to be opaque so
they are most often used in conjunction with a capping shutter of sorts - a
mechanical one for example.
Kerr Cells are related to Pockels cells.
andy
