Add a new dimension to your Holga camera...The Macro dimension! This set of two macro lens adapters is designed to work on both Holga 35mm and 120 series cameras for extra close-up work. This set includes the following: ML-30 lens has a focal length of 30mm. ML-60 lens has a focal length of 60mm. These lenses simply slide over the front bezel of the standard Holga lens. The focus of the standard Holga lens must be set to infinity. Simply measure the distance of the object, based on the lens you are using, to the surface of the lens and shoot. Its that easy!