Protect the front element of select ZM lenses with this 43mm Front Cap from ZEISS. It's compatible with the Biogon T* 35mm f/2.0, C Biogon T* 35mm f/2.8, Planar T* 50mm f/2.0, and Tele-Tessar T* 85mm f/4.0. The cap safeguards the glass against dust, scratches, and moisture when the lens is not in use. It features a spring-loaded center-pinch design for easy attachment and removal. This cap serves as a spare or replacement for the one included with your lens.