The 4" (100mm) Saga dome is made of BK-7 optical glass and delrin body with removable anodized aluminum sunshade.
Designed specifically for the Panasonic 8mm lens.
Its convex part is coated with Si02 silicon oxide that allows a refraction of 0.01% for a better transmission of light and in its concave part has an anti-reflection layer.
Available for N85 and Olympus PT
(If you have questions about the compatibility with your housing and lens model, do not hesitate to contact us).