Cinemascope lens

[vx1kOrnot]

i would like to know what this for

http://en.wikipedia.org/wiki/http://en.wikipedia.org/wiki/File:Scope_Aperture.jpg

And can it be a used on a 7D ?

i found it in a 2nd hand camera shop for 60$ USD

 

[bwwd]

link does not work
If its to 35mm projector then it wont work on close focus distances,you would not be able to focus close