Samyang 24mm T1.5 ED AS UMC VDSLR Lens.
The new Mark II (Mk 2) versions feature revised placement of the focus and aperture gearing, so all newest lenses have the gearing in the same place for convenience on rigs and professional follow focus systems.
Samyang 24mm T1.5 ED AS UMC VDSLR (Video DSLR) versions have been developed primarily for professional cine / movie making purposes where high quality fast prime lenses are the primary requirement. The VDSLR version feature follow focus gearing and decoupled aperture, which allow the user to smoothly and quietly change focus and aperture / depth of field whist filming, and link to professional follow focus cam systems.
The aperture and focus scale has also been relocated to the side of the lens to improve visibility of the scale.