This SMC Pentax-M 50mm F/1.7 lens is a great addition to your camera gear. It has a maximum aperture of f/1.7, which allows for great low-light performance. The lens is compatible with Pentax K-mount cameras and has a focal length of 50mm. The exterior material is made of aluminum, which makes it durable and long-lasting. The focus type is manual, allowing for greater control over your shots. The lens is also compatible with 49mm lens fronts and filters, making it a versatile addition to your collection. This lens is a standard type and belongs to the Pentax SMC series. It was made in Japan and is a high-quality product.  Also include are both the front and rear lens caps as well as a Phase 2 Skylight filter.