50mm prime lens with an aperture of F1.4. For Pentax. While I don't see any dust, debris, or mold inside the lens, this is only based on a visual inspection. I do not currently own a Pentax camera body, so I cannot confirm its functionality. - Brand: PENTAX - Model Name: FA 50mm F1.4 - Focal Length: 50mm - Maximum Aperture: F1.4 - Lens Type: Prime Thank you for looking.