Teleconverters for Canon cameras
A teleconverter (sometimes called tele extender) allows you to increase the apparent focal length of a lens, giving you a greater telephoto effect than a lens alone. Teleconverters allow increasing the focal length of lenses by coupling with them and thus essentially magnifying the image, allowing for tighter framing of subjects. Camera Gear offers teleconverters for Canon cameras from several manufacturers which are much more affordable than genuine Canon teleconverters
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Yongnuo YN-1.4X III extender
Yongnuo YN-1.4X III extender is a great alternative to the Canon EF 1.4X III teleconverter offering pretty similar performance for 3 times less price. Yongnuo’s version like Canons also packs 7 lens elements into 3 groups and reduces the lens maximum effective aperture by one stop. This is common for 1.4X teleconverters, while 2.0X teleconverters reduce the lens maximum effective aperture by two stops.
Just like the Canon 1.4x III Extender, this lens is only compatible with the longer Canon L lenses (135mm and up). You can’t use it with the 100mm 2.8 Macro L for instance. That’s because of the protruding optic that will not allow you to mount this on anything but the longer L lenses.
Yongnuo YN-2.0X III teleconverter
Yongnuo YN-2.0X III teleconverter is a great alternative to the Canon EF 2X III teleconverter offering pretty similar performance for 3 times less price. Yongnuo’s version like Canon’s also packs 9 lens elements into 5 groups and reduces the lens maximum effective aperture by two stops. This is common for 2.0X teleconverters, while 1.4X teleconverters reduce the lens maximum effective aperture by one stop.
Featuring electronic communication from the lens to the camera, this teleconverter allows for all standard functions of the lens to work as normal, including autofocus and image stabilization.