Optics Close-up lenses are for quick and easy close-up photography. The close-up lens is screwed on to the front of a lens like a filter. This close-up lens has 2 two achromatic elements to correct chromatic aberrations. They do not degrade any high optical performance.
This lens is suited for lenses with a focal length anywhere from 30 to 300mm.
Specifications:
Here is a sample of the difference between a normal view and a 10x close-up view.