Hi Mark, i am not an expert on this subject but there many threads on this forum about anamorphic lenses with many valuable information that you should look through.
(Anyone please correct me if i am wrong) There is one basic difference with anamorphic.There are anamorphic lenses(usually in pl mount) that mount directly on your camera(16mm,35mm,digital) and cost some thousands of dollars and there are the anamorphic adapters that are meant for projection purposes and people attach them in front of their prime lenses to achieve the anamorphic look.These can be found relatively cheap and the most well known are the iscos and the kowa. These lenses don't have regular back mounts so you will need some sort of a clamp to attach them on your prime lens.Also i ve never used one on an mk2 but since its a full frame camera you won't be able to use wide angle lenses with the adapters since you ll get black edges and vignetting.
But look around for threads in this forum where many technical issues have been explained by far more experienced people.