Multicoated for high resolution 7 elements in 4 groups Length 43.5mm Weight 184g Full AF operation with Teleplus 2X Pro 300 is possible when using camera lenses with maximum aperture of F4.5 or faster Digital Compatible Exposure factor 2 stops Available in Canon/Nikon/Minolta fitting Kenko teleconverters & extension tubes are not compatible with Canon EF-S Lenses. --------------------------------------------------------------------------------