just received my 24mm 1.4 problem is it appears it does not fit i set fstop to 22 like instructions say and still nothing the dots on the camera and lens are lined up still not working, Should this lens fall in place like my kit lens, the kit lens mounts with no effort, it just dropsin, the new Rokinon does not, have placed the lens on the camera body and rotated it 360 degrees several times and it still does not mount, is there a chance I am doing something wrong?