The Rodenstock 75mm F/4.5 Grandagon-N Lens allows to duplicate the 4 x 5" transparencies at a reproduction scale of around 2:1.The Rodenstock 75mm F/4 D Enlarging Lens is designed to be used in macro photographyThese Rodenstock Enlarger Lenses avoid distortion at a scale of 2:1 thus they are ideal duplication solution