Okay, I'm pretty good with my digital gear at getting amazing portriats, but I'm having issues with my Mamiya 645AF. I'm using one shot focus, depress the button half way, compose shot, and depress all the way. Yet, I'm seeming to have issues on getting the eyes too blurry. Is this an issue of expecting too much resolution from my film? (10 year old Velvia, original RVP, not Velvia 50.) Is it the AF of the camera? Any thoughts would be appriciated.