Canon Extender EF 1.4x III  type_Digital Cameras Calibrated all shutter speeds to

Calibrated all shutter speeds to within 1/4rd stop accuracy

you can do multiple exposures very easily

The lenses are technically interchangeable

but is worth noting if you're expecting perfection

which means that the leg extensions can be screwed in half for transport

Canon Extender EF 1.4x III &nbsptype_Digital Cameras Calibrated all shutter speeds toCanon Extender EF 1. 4x III teleconverter, in excellent cosmetic condition. Increases the effective focal length of the lens mounted to it by 1. 4x while maintaining complete communication between lens and camera. Canon's teleconverters are not general purpose: they will work specific lenses only, and autofocus function may vary by lens and camera. Be sure to check compatibility before buying! Clean glass and excellent function. Includes pouch.