I can offer you a much better (and cheaper) solution. First, if your camera takes interchangeable focusing screens (all canon FF cameras except 5D3), install screen Eg-S, which will make subjects really snap into focus vs the stock screen. Zeiss lenses have focus confirmation, meaning even though you rack focus manually, you still get a focus confirmation light / beep. Focus confirmation via the camera's AF system is just as accurate as focusing via live view sans tripod. Enjoy your Zeiss!