Selling due to equipment replacement. Used outdoors for about a year. It's an EF mount for Canon. Please check the photos for scratches on the lens cap and exterior. Used item, so no returns or exchanges. For a limited time, a lens filter and an EF to RF mount adapter will also be included. The SIGMA 135mm F1.8 DG Art lens has an 82mm filter diameter and offers excellent optical performance. - Brand: SIGMA - Model Name: 135mm F1.8 DG - Filter Diameter: 82mm - Series: Art Thank you for looking.