Kenko PRO 300 AF DGX 2.0X for Canon Lens(Black)

Exposure Magnification: 4 Times (Equivalent to 2 Diaphragm), Minimum Focus Distance same as Prime Lens, 51.0 mm Barrel Length, Precision Quality Multi-coated Optical Glass, Match the Optical Quality of Prime Lens (Even at the Edges) and Telephoto Zoom Lenses, Optical Design of Elements and Light Path is Wide Enough not to Cause Vignetting, Designed Specifically to be Used with Prime Telephoto Lenses of 100 mm or Above, Work Best with Telephoto Lenses of 200 – 500 mm, Can be Used with Prime Lenses, Does not Recommend for Zoom Lenses (Range Starting under 50 mm), Genuine Gate Array Integrated Circuitry (Unique Circuitry Maintains Signal Integrity between Camera Body and Lens), Updated Circuitry to Record Exif Data more Accurately, Meta-data Recorded with Digital Picture, Record Equivalent Aperture and Focal Length of Lens Setting Plus Tele-converter, Optically and Mechanically they are Prior High-quality Converters