ARRI / Zeiss ULTRA 16 primes are the sharpest, most high-contrast lenses available for the S16mm format. They are small, have modern mechanics that are pretty much identical to ARRI Ultra Primes, but this lenses were specifically developed for the Super 16mm format. They have a very fast T1.3 maximum aperture, and the lenses are at peak performance even when shot wide open. All the lenses have identical size and nearly identical weight, matched gear placement, and uniform 95mm fronts.