The Z3 offers all the properties you need in its slim tube diameter of just one inch: It is a proven, reliable companion for hunters who prefer to focus on the essentials. Features 3x zoom in a 1 inch rifle scope, 90mm of eye relief, a large field of view, practical reticle in the second image plane, rapid dioptic adjustment, and microstructre grooves for high efficiency baffling to prevent residual reflections inside the tube for crystal clear, high contrast images, evein in intense light. The Z3 is extrememly light and all exterior aluminum parts are anodized for scratch resistance. All Z3 scopes are supplied with transparent protective lens caps.
Big Book Catalog, Issue:66, Page:539
Sinclair, Issue:2A, Page:186