Thank you for viewing. This is a set of the underwater micro fisheye lens UFL-M150 ZM80 for compact digital cameras and an M27-M67 mount conversion ring. Simply attach the lens to your housing with a single touch, and your compact digital camera becomes an "underwater insect-eye lens." Please check the manufacturer's website for details. Used only 1-2 times and then stored in a dehumidified cabinet, so there are no noticeable scratches. The optics are also in good condition, but this is a used item, so please refrain from purchasing if you are sensitive to such things. The price has been set considering a discount, so price negotiations are not possible. Thank you for your understanding.