@Tommyboy, I have same fotodiox lens mount adapter for canon eos for my Rokinon 35mm canon lens and boy does that thing suck!! Haha lol kidding, works like a champ!! Love love that lens, any person who don't have a 35mm should invest in it.
I have the Fotodiox too, and it is great for what it is. Really well made and cheap, but obviously no aperture control. All the EOS lenses I have are soft wide open, the EF 50mm, f1.8 being the only passable, so it doesn't get much use.