"Ekran-4" (1966-1975) - an amateur 2x8 mm movie camera with a spring drive. Speeds 8, 16, 24, 48 fps and time-lapse shooting. Charging with standard 2x8 mm 10 m reels. Saturn-6 1.8/12.5 lens, two afocal attachments (wide-angle - 0.5× and long-angle - 2.0×) on the turret. Parallax-free viewfinder with selection of 20% of the light flux by a prism built into the lens, eyepiece loupe with variable magnification. Semi-automatic aperture setting using an exposure meter with a selenium photocell. Of the Soviet film cameras, the 2x8 mm format has the smallest dimensions.