Alan Gordon Mark Vb Director’s Viewfinder: 12:1 Zoom Ratio Ring. Adjustable Aspect Ratio Ring. The zoom range for the various formats is as follows: 35mm: 18-200mm, 35mm Anamorphic: 35-420mm, 16mm film: 8.5-100mm, S16mm: 10.5-125mm, 1/2″ Video: 6.5-80mm, 2/3″ Video: 8.5-75mm, 1″ Video: 10.5-125mm