I received this from an acquaintance, but I own a PENTAX body, so I am listing it for sale. Operation has not been confirmed, so it is listed as junk (very poor condition). Please bid with this understanding. The internal condition is good. There is no dust or mold. The aperture ring and aperture blades operate smoothly. Thank you. ★No problem with immediate purchase. ★Please feel free to discuss price reductions. The PENTAX smc PENTAX-A MACRO 50mm F2.8 is a standard prime lens released in the 1980s with half-macro capability (maximum magnification ratio of 0.5x). It is one of the highly regarded "masterpieces" from the film era and exhibits excellent rendering performance even on digital SLR cameras. Main Specifications Item | Details ------- | -------- Mount | Pentax K-mount (KA mount) Focal Length | 50mm Maximum Aperture | F2.8 Maximum Magnification Ratio | 0.5x (Half Macro) Minimum Focusing Distance | Unknown (Current D FA MACRO 50mmF2.8 is 0.195m) Focus | Manual Focus (MF) Aperture Control | AE (Automatic Exposure) possible with A position Compatible Format | 35mm Full-size compatible (for digital/film) Features and Evaluation Bright Half Macro: While the maximum aperture for 50mm macro lenses in the M series was typically F4, this lens achieves F2.8, allowing for brighter shooting. Digital Compatibility: Although not designed specifically for digital cameras, its careful optical design allows for high rendering performance on digital cameras, and it is praised for producing clear images with minimal chromatic aberration. Rendering Performance: The rendering is relatively soft around the maximum aperture, but it becomes very sharp and clear when stopped down to around F8. The bokeh at close focusing distances is also reputed to be beautiful. Operability: With an aperture ring that includes an A position, AE shooting in A mode or program mode is possible. While it does not have autofocus, macro photography is fundamentally manual focus, so this is not considered an issue. Compact and Lightweight: Compared to current digital-compatible macro lenses, it is relatively compact and lightweight, making it highly portable. Maximum Aperture...2.1-2.8 Other Features...Old Lens Other Features...Old Lens, with rear lens cap