DESC: All PCF WP models offer a fully waterproof, nitrogen-filled body, outstanding optical performance with aspherical optical elements, excellent viewing comfort and a stylish body design. In addition, they are fully encased in a protective rubber housing. Because of their rugged waterproof and fog-proof design, the PENTAX PCF WPs are ideal for use around and on the water, as well as for observations in harsh weather and extreme climates.