I'm going to be shooting ECU macro shots of ink swirling around in a fishtank. I will be shooting in a studio with as much light as I need and want to be able to get below the tank as well as shooting from the side. I am thinking of using the T-Rex system and shooting on Zeiss Ultra Primes. I have assisted on the T-Rex many years ago so know that it is incredibly flexible and i think once mounted on a dolly this system will enable me to move around the fishtank with ease. My question is regarding the lenses. What is the magnification factor when using the T-Rex? How close will I be able to focus and which of Ultraprimes will best allow me to shoot ECU details of ink swirling within a 1' cubed tank?