ANAMORPHIC Jupiter-37A HELIOS 44-2 Mir-1B Jupiter-9 Cine mod lens. Number of lenses / groups: 6 lenses in 5 groups. The maximum open aperture is 3.5. The number of aperture blades - 12 pcs.The angle of view is 18 degrees. Number of lenses / groups - 4/3 pcs. The minimum focusing distance is 1.2 meters. The thread for light filters is? Enlightenment type - single layer. The focal length is 135 mm. Scale of diaphragms: from 2 to 16. Focusing range: from 0.5m to 20m to infinity. Famous Helios 44-2 anamorphic bokeh and flare prime cine lens with neutral color & oval diaphragm. They deliver beautiful blue horizontal flares and oval bokeh and in the same time preserve natural color of footage, so you can shoot low light and daylight scenes without any color correction issues. At your request i can change mount to MFT, Fuji X, Sony, Canon EF mount, for free. EXCELLENT CONDITION: Optical and mechanical systems works properly and smooth. The glasses are clean without a fungus and without chips and scratches. Aperture and focus are working properly. Thank you for visiting our store!