This Soligor Auto Tele Converter 2X is a great addition to any Pentax-K mount camera setup. Made in Japan with durable aluminum exterior material, this converter allows for a maximum aperture and a fixed/prime focal length that converts 2X. It is compatible with a variety of lenses and filters, and its manual focus type allows for greater control over your shots. The Soligor Converter series is well-known for its quality and reliability, making this a great investment for any photographer. Comes with a case for safe storage and transport. In good shape and functional. Appears to be clean on the inside without scratches! I am not a professional photographer so if I missed anything please let me know! Thanks!