The Rodenstock Rogonar-S 90mm f/4.5 Lens is a general-purpose lens used to produce sharp enlargements of full detail of images at high magnification. It has a simple optical design and features incredible performance. The Rodenstock Rogonar-S Enlarging Lens is used for amateurs and professional developing labs in developing standard print formats.It can be used with images with low light loss towards cornersThe Rodenstock Enlarging Lens can be used for 6 x 7cm enlargingIts magnification ranges between 2x and 8xAperture Range : f/4.5-22Dimensions: 1.4" x 2" (H x W)