The barrel of the Mastcam-Z instrument will be different from Curiosity's Mastcam. Mastcam-Z contains a zoom mechanism with two lens groups that will move inside a rotating barrel in order to zoom in and out over a range of at least 4:1. This design was current as of July, 2015.
This image is in the public domain.
Original image data dated on or about July 1, 2015