The lens "Industar-61 L/Z MC" is an old Soviet lens that was produced in the USSR for Zenith cameras.
Below are the main characteristics of the lens "Industar-61 L / Z MC":
Focal length: 50mm
Maximum aperture: f/2.8
Minimum aperture: f/16
Lens construction: 4 elements in 3 groups
Filter Thread Diameter: 52mm
Focal length: manual adjustment
Backlight: Multi-Component Coating (MC) that helps reduce internal reflections and peeping.
The Industar-61 L/Z MC lens was popular in its time and was recognized for its good optical performance and compact size.