A spacer for extending an image from a lens assembly of a camera comprises a hollow tube having a front engaging portion capable of being connected to the lens assembly and a rear engaging portion capable of being connected to the camera body; and a first lens installed in the tube; and a second lens installed in the tube and being spaced apart from the first lens. The tube is telescopic. This is achieved by causing that the tube has a plurality of sections or the tube has at least two sections which are threadedly engaged or a compressible and expandable snake like structure is installed between two sections of the tube so that the tube can be prolonged or compressed to adjust the whole length of the spacer. Furthermore the first lens and second lens are concave lenses or convex lenses which are symmetric or asymmetric.