Canon's Extender EF 1.4x III and Extender EF 2x III multiply the focal lengths of most Canon normal, macro and telephoto lenses by a factor of 1.4x and 2x respectively.
Both extenders contain built-in microcomputers that provide seamless functionality between Canon (D)SLRs and lenses. Other features found on and within each of these new tele-extenders are Fluorine lens coatings and weather and dust-proof construction.
| EF 2X III Spec: | Magnification - 2.0x | ||
| Lens Elements/Groups - 9/5 | |||
| Light Loss 2 Stops | |||
| Length 2.1" (52.7mm) | |||
| Diameter 2.8" (72.0mm) | |||
| Weight 11.46 oz (325g) | |||
| EF 1.4 III Spec: | Magnification - 1.4x | ||
| Lens Elements/Groups - 7/3 | |||
| Light Loss 1 Stop | |||
| Length 1.1" (27.2 mm) | |||
| Diameter 2.8" (72.0 mm) | |||
| Weight 7.9 oz (225g) | |||
