Employing an advanced optical path that delivers maximum contrast and stunning color fidelity, the DiaScope spotter provides high-resolution viewing and excellent twilight performance. Featuring T* multicoated fluoride glass lenses, the DiaScope's field of view offers crisp edge-to-edge clarity with resplendent details. To ensure optimum viewing regardless of the climate - the rugged ergonomic housing is sealed, waterproof, and the internal lens surfaces are totally fogproof. A significant increase in the DiaScope's all-weather performance would seem impossible - yet - the exterior lens surfaces have been treated with Zeiss' LotuTec water-repellent protective coating to ensure the clearest view possible in any weather conditions.