Abstract: A portable viewer for microfiche transparencies. The viewer comprises a pair of spaced members between which the transparency to be viewed is inserted. A viewing system including an adjustable lens on one member and an optically aligned aperture in the other member is provided, the lens being adjustable to permit the focus thereof to be changed with lock means to retain the lens in selected focusing position. A swing away light diffuser, and auxiliary light source are provided, the diffuser serving to diffuse artificial light and, when desired, natural light. A table stand and wall attaching magnets are included to permit the viewer to be operated in a free standing fashion or to be supported on an adjoining wall surface.