prismatic sight

For maximum accuracy a dedicated prismatic sight can be attached to the rifle.

The New Zealanders captured great numbers of machine-guns (some with prismatic sights) including two Lewis guns.

Hand or sighting compasses include instruments with simple notch-and-post alignment ("gunsights"), prismatic sights, direct or lensatic sights, and mirror/vee (reflected-image) sights.

To save time in development the sight was based on the already existing type G prismatic sight, basically a telescopic gun sight folded into a shorter length by a series of prisms.

A magnifying lens (KB-14) or prismatic sight (KB-77) is mounted at one end of the instrument with a crosshair providing a view of the disc, containing both forward and reciprocal bearings.