Master Prime lenses The Master Prime lenses have been jointly developed by ARRI and ZEISS. They are both fast and have an optical performance surpassing that of all standard speed primes. Master Prime lenses open up new creative opportunities of film making. Unique high speed prime lenses with unprecedented resolution Virtually no breathing Master Prime lenses offer excellent optical performance across the whole T-stop range from T1.3 to T22 The patented Dual Floating Elements technology eliminated breathing in the Master Prime lenses Uniform positions of iris and focus gears Built-in Lens Data System (LDS) Zeiss 100mm LDS Master Prime T1.3 weighs 6.4 lbs. with a front diamet er of 114mm and close focus at 3'6". Arri's Master Primes lenses are a fast, revolutionary and unique new generation of high speed prime lenses with unprecedented resolution, incredible contrast and virtually no breathing. A wide stop of T1.3 allows shooting in low or available light for more natural-looking shots, creating the cinematic look of an extremely shallow depthof field. Its built-in Lens Data System (LDS) shows real-time lens status and depth of field information on the video assist or on a dedicated Lens Data Display, and is especially useful when using a crane or Steadicam.