11x Zoom---- Multi-coated optical elements, 11X magnification, high definition and durable. The body of this 11x director's viewfinder is made of high-quality aluminum material, wear-resistant and durable Telescopic Design---- This directors viewfinder has a telescopic design and can be pulled out for different purposes. The length is about 2.56"/65mm, diameter is about 1.62"/ 42mm 37mm P=0.75---- 37mm standard filter thread, allows for the addition of a 37mm wide angle converter. With clear vision, this directors viewfinder is a practical photography accessory With Lock Ring---- Eyecup has a lock ring, you can click it to stop for aspect ratio ring. The director viewfinder is suitable for most film and TV formats, all standard aspect ratios including 16:9 Fitment---- 1"(S16), 2/3", 1/2" & 1/3" TV; Anamorphic, 35 & S16 Film Aspect ratios: 4:3 / 1.33 (TV, ~ Academy 35mm & ~ 16mm film), 1.66 (Super 16), 16:9 / 1.78 (HD), 1.85 (Widescreen 35), 2.2 (65mm film), 2.4 (Anamorphic), 2.55 (Dinemascope) Specification Materials: Aluminum + Multi-coated Optical Glass Color: Black Rear Eyepiece: Adjustable Filter Thread: 37mm P=0.75 Length: Approx. 2.56"/65mm Diameter: Approx. 1.62"/ 42mm Weight: Approx. 143g Formats: 1"(S16), 2/3", 1/2" & 1/3" TV; Anamorphic, 35 & S16 Film Aspect ratios: 4:3 / 1.33 (TV, ~ Academy 35mm & ~ 16mm film), 1.66 (Super 16), 16:9 / 1.78 (HD), 1.85 (Widescreen 35), 2.2 (65mm film), 2.4 (Anamorphic), 2.55 (Dinemascope)