The lens cap can be 2-parts. Shared there is a wide-angle lens. Screwed to the front part from, forms the rear part used alone a Marco lens. The Marco essay, however, from the center outward-going extremely strong distortions. The wide-angle attachment leads with my Panasonic Lumix FZ200 at full wide-angle (24mm) of the original lens, and this additional filter thread screwed onto the lens to shading or edge covers. To return to have a full picture you have to zoom about 2-3x Zoom purely to give but in the end but then 1. no more wide-angle magnification, has even a slight reduction. 2. the expected by the wide-angle fisheye effect almost absent and I would describe it only as distortions due to the lens quality and not as a fisheye effect. Therefore, absolutely useless for me. The first time in many years I will send back something from Amazon because of non-pleasure or of poor quality. See me uploads to compare.
