The anamorphic lenses use for shooting of 35 mm movie.
And can be use for 16 mm film shooting too.
But, from practical side, the better to use of full finished cinema shooting anamorphic lenses,like russian 35 BAS.
yes, of course, you can attach of any front anamorphic adapter.
You can upgrade K-3 camera on Arri Pl lens mount and attach any cinema shooting anamorphic lenses with Pl mount.
To visit of my web pages, can find a lot of information about anamorphic lenses.