The sight is of the type in which a virtual image of a graticule pattern (3) is made to overlie the view of a target through the sight along a viewing axis of the sight. The sight has an optical arrangement with a single composite graticule pattern having a light transmissive component and a light reflective component. The composite graticule pattern may be illuminated by light from the sky above the target or by the light from an artificial source to give a virtual image of at least a part of the single graticule pattern. Thus an artificial light source may be permanently mounted to the sight, to allow a daylight reflective graticule to be used during daylight and a transmissive graticule to be used at night time. During the day superimposed images of both graticule patterns may be viewed.
