Cleaning out the closet. I have a used Inon UWL-100 type 1 screw on underwater wide angle optic for sale. There are small scratches on the front element which are not apparent on images. Clean rear element. Underwater, this increases angle of view to 100.5 degrees; above water to 158.5. Rugged 5 elements in 4 groups. Use and rub marks on the body. Comes with a dual lens M67 lens holder for Ultra Lite type arms. $90 PayPal with free shipping to US residents.