German WW2 binocular, video clip

I've seen these German WW2 binoculars on Ebay for sale a few times.
I'm not sure how good they are, selling for $1000-$2000 I think.
Used for observation and gun positioning. Now days can be used for
astronomy or it may have a collectors value.
Any way, I found a WW2 video clip, few seconds, binocular in use.
Scroll down to middle of the web page and click on the upper right picture.
Interesting, there is a frame mounted on top of the bino.

http://www.pzg.biz/films_newsreels6_nazi.htm

Julius