We've noticed cases where customers purchase items without reading the product description and subsequently leave negative feedback. To prevent any issues, please be sure to read the entire product description and agree to its terms before making a purchase. Also, if there is no response to a comment, it may be deleted after a certain amount of time. Thank you for your understanding. This is an MC PENTAX-M 50mm F2 lens. It is a manual focus prime lens for Pentax K-mount, manufactured by Asahi Optical Co. Key Features: Focal Length and Aperture: A standard 50mm lens with a maximum aperture of F2. Construction: Features a 5-element, 5-group lens configuration with Super Multi-Coating (SMC) to reduce flare and ghosting, providing excellent contrast and color reproduction. Production Years and Versions: Manufactured from 1979 to 1985. Early models had a metal lens barrel, while later models used some plastic parts for weight reduction. Compatibility: Compatible with Pentax K-mount film cameras, as well as modern digital SLR cameras via a mount adapter. [By using a mount adapter, it can be used with mirrorless cameras from Sony, Olympus, Panasonic, Canon, Nikon, etc.] Filter Diameter: The filter diameter is 49mm. There is no noticeable dust, debris, mold, or haze that would affect the image quality, and it is in a clean condition. * *Caps are not included (front and rear)* * * *This is a USED item that has been handled by people, so please refrain from purchasing if you are sensitive to imperfections or seek a perfect item.* * If you are interested, please consider purchasing. * *Returns and claims are not accepted after purchase.* * Also, in the case of returns or cancellations due to the buyer's circumstances, the buyer will be responsible for the shipping costs (round trip), so please be aware of this beforehand. Thank you for viewing. Thank you.