Nisi Lenspen consists of high technology molecule materials with superfine frosted surface. The high quietly soft brush is retractable. The unique molecule high technology of cleaning tip won?t dry out and leak liquid. It is environmentally friendly. Nisi Lenspen is safe for all optical lenses and filters. It won?t affect lens coatings. Nisi Lenspen will remove fingerprints, dust and other debris easily. It will be your first choice to clean optical equipments. The ef 50mm f/1. 2l usm is a peerless new standard lens featuring an ultra-large aperture for a narrow depth of field and soft background blur so loved by photographers everywhere.