Abstract: A photographic enlargement system of the kind used in producing posters or giant-size prints has been improved by installing the focal plane, the photographic-paper feeding mechanism and a focal-plane-masking roller blind system on a carriage which can be moved toward or away of the optical enlarging system for focussing the image. The carriage forms a compact and self-contained unit which is enclosed in a light-tight fixed casing with which the optical enlarging system is integral.Convenience and reliability of use are the distinguishing features.