Canon
EF 2x Extender III
Teleconverter
The EF 2x Extender III from Canon serves as the perfect accessory to select Canon EF Lenses, giving you a 2× increase in focal length and allowing you to get even closer to the action and capture that perfect shot. The EF 2x Extender III is built with special coatings that minimise flare and ghosting, and help prevent dust and grime buildup.
When using this extender, the lense's f-number is reduced by one stop, so autofocus is possible only with lenses brighter than f/4. This extender is compatible with fixed focal length L-series lenses 135mm and over, as well as the EF 70-200/2.8L, EF 70-200/2.8L IS, EF 70-200/4L, and EF 100-400/4.5-5.6L.