Interchangeable Mount System Zeiss Compact Zoom CZ.2 lenses are available in five different mounts – PL, EF, F, Micro 4/3 and E. More information on Zeiss interchangeable mounts in this PDF.
The Compact Zoom CZ.2 T/2.9 comprises all the features of a cine-style lens. Extra-long focus throw, constant T-stop of 2.9 across the entire zoom range and easy-to-read markings. But the main difference to a regular photo zoom lens is a phenomenon called “focus shift”. When zooming in on an object with a photo zoom lens you always have to adjust focus. As soon as you change the image frame the position of the sharp plane of focus changes as well. In still photography this is not a problem. But in motion picture it is a big issue because your details might be out of focus. Your scene is ruined.
A highly precise mechanical adjusting concept is used to compensate this negative effect with the Compact Zoom CZ.2 T/2.9. The goal is to stabilize the image position while zooming. Three independent lens movements are necessary to achieve this. You have a sharp crisp image without refocusing.