JJC L-R4 Body Cap and Rear Lens Cap are specially designed for Pentax K Mount DSLR cameras and Pentax K mount lenses. When storing the camera without a lens attached, the Body Cap can effectively protect the image sensor and internal camera components from dust, moisture, and other elements. Besides, the Rear Lens Cap also can effectively protect your valuable lenses against scratches, moisture, dust and fingerprints when it is not attached to the camera. JJC L-R4 Rear Lens Cap replaces Pentax Rear Lens Cap (B).