For photography lovers looking for a camera lens that captures clear foreground images while providing unique and beautiful bokeh affects, the Helios 44-2 is worth considering. Lens construction within this Helios camera lens for Zenit/Pentax is six elements in four groups. Though it was made in the early 1990s, this 58 mm f/2.0 lens is compatible with many DSLR cameras with an adapter. It attaches to traditional, 35-mm cameras via the M42 x 1 thread. The Helios 44-2 features a maximum focal aperture of f/2.0. High focal apertures yield pictures with detail finer than what is perceived with the human eye. The aperture of this Helios camera lens for Zenit/Pentax is manually adjusted via the aperture ring. Focal length varies a little in this 58 mm f/2.0 lens from 58-60 mm. Because of its adaptability, one-of-a-kind bokeh effects, and high focal aperture, the Helios 44-2 is a fine camera lens for producing photos with unique effects. Lens mount: M42 Focal length: 58mm Relative aperture: 1:2 Scale of diaphragms: from 2 to 16 Focusing range: from 0.5m to 20m to infinity Condition: This lens is in good working condition, lens glass clear, have few general not visible cleaning mark this not give any effect on the picture and working.