The Canon EF Extender 1.4x III is a popular teleconverter. Key features include:
Improved Optical Performance
High Quality Optics. The Canon 1.4x Teleconverter III features three groups of seven elements that ensure improved optical performance. All optical elements use Canon’s super-spectra coating, which reduces ghosting and flare to minimize post-processing requirements and a fluorine coating on the front and rear elements makes smudge marks much easier to clean.
Full Electronic Pass-Through. The extender features an integrated processor which ensures all focusing, metering, and ID information is available. Canon claims that, when combined with the range of premium Canon L-series lenses, these extenders enable higher AF accuracy.
Does this teleconverter support autofocus?
Which lenses do you recommend for use with this teleconverter?
Is this teleconverter incompatible with any lenses?
Focal Length & Maximum Aperture
7 elements in 3 groups
Max. Diameter x Length, Weight
2.8 x 1.1 in, 7.9 oz. / 72.0 x 27.2mm, 225g
Crop, Full Frame