To install any of the lenses, align the two red dots on the camera body and lens mount ring. Then align the two red dots on the rear of the lens. Insert the lens carefully so the notch in the lens' distance scale ring fits over the square projection on the lens mount ring. When the lens is seated, rotate it clockwise (about 1/8 turn) until it locks in place. Avoid changing the lenses with sunlight striking the front of the camera.

To protect the delicate mechanism of the shutter, never leave the camera without a lens installed.