Computar zoom autoiris F1.0 (CS mount) Description: high quality and good for big sensors up to 1/3" sensors without vignetting. Tested in a 1/2" sensor it has a very little vignetting using it at the first 33% widest zoom... I calculate that between 4-8mm zoom, it has no vignetting. Manual zoom and focus and iris rings have locking screws. This is CS mount lens (not C mount). Nice for low light applications. Greatest quality. See last pictures for original specs. Issues: some normal usage marks, but they do not affect performance.