HELIOS-44M-4, a 58mm, f/2 prime lens. - Model: HELIOS-44M-4 - Focal Length: 58mm - Maximum Aperture: f/2 - Mount Type: M42 - Accessories: Generic lens cap This is a popular Russian lens. The lens appears to be clean, but please check the images as it is a used item. The exterior has some scratches, etc. There appears to be no major damage. Made in Russia, so please don't expect high build quality. It rattles when shaken, but please only purchase if you are comfortable with this. No returns. No cancellations. Thank you for viewing. The mount is M42, not K. Please be aware.