A viewing apparatus for producing a stereoscopic image for an observer, the viewing apparatus comprising: first and second video projectors for projecting respective ones of first and second video images of an object, the first and second images being different images which are one or both of spatially and angularly shifted in relation to the object so as to convey parallax between the images, the video projectors comprising first and second video displays which are driven by first and second video signals to display respective ones of the first and second video images, wherein the optical axes of the displays enclose an acute angle, and first and second optical arrangements for focussing light from the respective images as displayed by the first and second displays to the first mirror, each optical arrangement comprising a lens, the lenses being located side by side and having optical axes enclosing an acute angle; a first mirror which receives light from the first and second video projectors, wherein the first mirror is located in relation to the first and second video projectors such that focussed images of the object are produced at the first mirror and the first mirror is a concave mirror with a radius such that exit pupils of the lenses are reflected by the first mirror to a viewing plane so as to be viewable at the respective eyes of the observer as a stereoscopic image; and at least one further mirror (31, 31b) located in relation to the video projectors and the first mirror such that light from the lenses of the video projectors is reflected onto the first mirror by the at least one further mirror; wherein there is an angular component (β) between incident and reflected light paths of the images at the first mirror such that the reflected light path does not intersect the further mirrors; and wherein the first and second optical arrangements each comprise an additional mirror located in relation to the video display and lens of the respective video projector such that light from the video display is reflected to the lens by said additional mirror, and wherein the additional mirror of the first optical arrangement and the additional mirror of the second optical arrangements subtend a reflex angle between them. first and second video projectors for projecting respective ones of first and second video images of an object, the first and second images being different images which are one or both of spatially and angularly shifted in relation to the object so as to convey parallax between the images, the video projectors comprising first and second video displays which are driven by first and second video signals to display respective ones of the first and second video images, wherein the optical axes of the displays enclose an acute angle, and first and second optical arrangements for focussing light from the respective images as displayed by the first and second displays to the first mirror, each optical arrangement comprising a lens, the lenses being located side by side and having optical axes enclosing an acute angle; first and second video displays which are driven by first and second video signals to display respective ones of the first and second video images, wherein the optical axes of the displays enclose an acute angle, and first and second optical arrangements for focussing light from the respective images as displayed by the first and second displays to the first mirror, each optical arrangement comprising a lens, the lenses being located side by side and having optical axes enclosing an acute angle; a first mirror which receives light from the first and second video projectors, wherein the first mirror is located in relation to the first and second video projectors such that focussed images of the object are produced at the first mirror and the first mirror is a concave mirror with a radius such that exit pupils of the lenses are reflected by the first mirror to a viewing plane so as to be viewable at the respective eyes of the observer as a stereoscopic image; and at least one further mirror (31, 31b) located in relation to the video projectors and the first mirror such that light from the lenses of the video projectors is reflected onto the first mirror by the at least one further mirror; wherein there is an angular component (β) between incident and reflected light paths of the images at the first mirror such that the reflected light path does not intersect the further mirrors; and wherein the first and second optical arrangements each comprise an additional mirror located in relation to the video display and lens of the respective video projector such that light from the video display is reflected to the lens by said additional mirror, and wherein the additional mirror of the first optical arrangement and the additional mirror of the second optical arrangements subtend a reflex angle between them.