Picture Size - 35mm Full size
Lens Construction - 9 elements in 5 groups
Front Mount - Canon EF Mount (11 contacts)
Rear Mount - Canon EF Mount (7 contacts)
Dimensions - 72.0 x 52.7mm
Weight - 325g
Compatibility
This extender is only 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. AF compatibility also depends on the combination of the above lenses and DSLR body type.