This double element accessory attaches to the front of the lens and changes closest focusing distance from infinity to 500mm approx 197 from front of lens it is designed for ef lenses and canon powershot cameras note requires appropriate conversion lens adapter when used with powershot camerasthis 58mm close up lens attaches to front of lens and changes closest focusing distance from infinity to 500mm approx 197 from front of lens it is intended for ef lenses and powershot pro90 i