The Helios 44-2 features a maximum focal aperture of f/2.0. Focal length varies a little in this 58 mm f/2.0 lens from 58-60 mm. Cinema 4K 35 mm HELIOS-44-2PL-Mount 58mm Lens. Focal length: 58mm. High focal apertures yield pictures with detail finer than what is perceived with the human eye.
