The Eclipse prism assembly features a 62-mm hermetically sealed, water-resistant, nitrogen-filled prism canister.

The prism can be set at a -40-mm true nodal point constant which offers optimal angle measurements, even when tilting the prism in either the horizontal or vertical axis.

Unlike most tilting prisms, the optical center of the prism stays on point. The tilting prism holder, canister and target are constructed of DuPont Zytel.

It includes a reversible, two-color target (black & white / black & yellow) and a peep sight collimator. A -30 mm adapter is included.

Height from base of prism to center of glass: 38 ft (115 mm).

Weighs 1.15 lb (0.52 kg)