The PENTAX SMC PENTAX-M MACRO 50mm F4 K Mount Lens is a high-quality macro/close up lens designed for Pentax cameras. Made in Japan in the 1970s, this lens features a maximum aperture of f/4 and a focal length of 50mm, perfect for capturing stunning close-up shots. With manual focus and an aluminum exterior, this lens is durable and reliable for all your photography needs. The lens comes with a 1-month manufacturer warranty and is compatible with 49mm filters, making it a versatile and essential addition to any photographer's gear.