The SIGMA 30mm F1.4 DC DN lens has a 52mm filter size and offers sharp rendering and beautiful bokeh. - Brand: SIGMA - Model Name: 30mm F1.4 DC DN - Filter Size: 52mm - Series: Contemporary Thank you for viewing. I am selling this lens to organize my collection. I don't see any mold, and while there is some wear and tear, it appears to be in good condition. This is a used item, so I don't recommend it to those who are concerned. Thank you.