This close-up lens allow you to take macro pictures covering a subject field with the area of half a postcard.
Cameras fitted with normal lenses do not permit us to move closer than a certain minimum distance from the object being photographed. The Close-Up lens, which is simply mounted in the front of our normal taking lens, permits the taking of close-ups and also makes possible the photography of details which would be quite impossible without using the Close-Up lens.
It doesn't block any light, so they only alter the reproduction ratio and greatly increase the working range of standard and telephoto lenses. For reasons of quality, stopping down to at least f/8 is recommended.