I use an Arca-Swiss B1 ballhead with this camera and a Kirk quick release plate. For vertical shots, I use the groove in the ballhead to change the camera's orientation from horizontal to verticle. Can anyone tell me whether the Kirk L-bracket plate is more convenient? Is it solid in verticle orientation? Does having the plate on the side of the camera affect the ergonomics of hand-holding? Given that the plate is on the side of the camera that has the two lugs for carrying the camera in verticle orientation around one's neck, can that still be done? And does the back open easily to change film? Thanks for any comments.