This 2 1/2" high, 11/2" wide camera attachment is a zoom lupe, #816 by Peak. It is used to enlarge a portion of a map or picture. It comes in its small case for protection. I have a number of camera attachments and vintage cameras for collectors, and will combine orders for discount and shipping savings. Please email me with any questions you may have, and thank-you for shopping here at Something Wonderful.