Canon 72 Close-up Lens 500D, for Lenses 70mm to 300mm, Double Element
The 250D/500D series close-up lenses incorporates a double-element achromatic design for maximum optical performance, while the standard 500 series features single-element construction for maximum economy. The 250 close up lenses changes the closest focusing distance from infinity to 250mm approx. 9.9", and the 500 close up lenses changes it to 500mm approx. 19.7".