TAMRON 28-75mm F2.8 DiIII RXD / Model A036SF (for Sony E / Full-frame) Purchased in March 2021. I kept it attached to my camera. I used it about 1-2 times a month, mostly for travel and outings. There are no operational issues, and it works without any problems. (I am a novice, so I don't have the technical skills to do a detailed check...) The exterior shows signs of use, but there are no noticeable stains or scratches. Thank you for your understanding. I have been using it with a protective filter attached since I purchased it. Aperture: 2.1-2.8 Focal Length (Wide): 71-150mm Focal Length (Telephoto): 25-28mm