the optical distortion device which can make a contact copy of a photographic film image with one dimension of the copy lengthened or shortened while the perpendicular dimension is unchanged is comprised of a pair of cylindrical motor driven rollers , at least one of which can be driven at a variable speed . the axes of the rollers are disposed parallel to each other and to a narrow slit through which a beam of light is directed . a photographic image and a sheet of photosensitive material are disposed in superimposed relation with one edge of each secured to a respective roller so that upon rotation of the rollers the photographic image and the photosensitive sheet will be simultaneously moved over the light slit . by varying the speed of one motor so that its rate of rotation will be greater than , equal to or less than the rate of rotation of the other roller the dimension of the image in the direction of movement can be made greater than , equal to or less than the dimension of the original in the direction of movement .