The SIGMA 56mm F1.4 DC DN is a high-performance prime lens with a 55mm filter size. I am selling it because I am changing my equipment. This was a lens I personally loved very much; it produces beautiful images, and I have used it with care. Lens condition: There is some dust inside the lens that does not affect image quality, and there is no mold or clouding. There are some minor scratches, but overall, it maintains a clean appearance. I hope to sell it to someone who will cherish it. - Brand: SIGMA - Model Name: 56mm F1.4 DC DN - Filter Size: 55mm - Type: Prime lens - Series: Contemporary Thank you for looking.