I purchased this last month, but it didn't quite suit me, so I'm putting it up for sale. Appearance: Shows signs of use. Optics: Some dust and particles, and possibly some minor mold near the front element, but it didn't affect the photos. - Brand: PENTAX - Model Name: DA 40mm f2.8 Limited - Filter Diameter: 49mm - Features: Prime lens Thank you for looking. Size: Pentax K-mount