All types of lenses are available in the market has a point where if we move closer to the object image, the lens will not focus (blur). In general, this point is called the Minimum Focusing Distance (MFD) or a minimum focusing distance. MFD is expressed in units of length (eg 0.5 m) measured from the distance of the light sensor in the camera until the object image. If a lens, like the photo above has the MFD 0.25 meter (25 cm) means that the minimum distance of the object image to the image sensor so that images remain sharp is 25 centimeters, so we take photos of objects closer to the camera, the image will begin to blur.