The Helios 44M-4 58mm f/2 Standard Manual Prime Lens is a vintage camera lens from the 1980s, manufactured in the Russian Federation. With a maximum aperture of f/2 and a focal length of 58mm, this lens is designed for M42 mount cameras, specifically Pentax. The lens is made of aluminium and features manual focus. It is compatible with 52mm front filters and can be used with both film and digital cameras. The Helios 44M-4 lens is a high-quality standard prime lens that produces sharp images with a smooth bokeh, making it a valuable addition to any photographer's collection.