Focal length: 65mm Field of view angle: 66° Frame size: 60×60 mm Number of lenses/groups: 6/5 Working distance - 74.1 mm Relative aperture: 1:3.5 Aperture scale limits: 1:3.5–1:22 Number of aperture blades: 6 Aperture adjustment - “Blinking” Near focusing limit - 0.5 m Resolution (center/edge) - 42/20 lines/mm. Weight - 564 grams Mechanics work well. Diaphragm only in open position. Made in USSR ------------------- The item in this auction is sold "as is". If an item has not been tested, the risk of the item not working lies with the buyer. This means that no claims can be made about the functionality of the item after the sale unless it does not match the description above.