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Canon Extender EF 1.4x III Review -

Started Feb 6, 2017 | User reviews thread
RS_RS Senior Member • Posts: 1,788
Re: Canon Extender EF 1.4x III Review -

The PROS:
* Excellent image quality.
* Can be used as a Manual Focus Only tool with compatible lenses.
* Sharper than the EF 2x III extender (which is slightly softer).
* Lightweight and easily carried.
* Matches the stark-White tone of the newer white Canon L-Series lenses.
* Extremely well built.
* More robust (more lock-down assembly screws!) than previous versions.
* Increases the focal length of the lens used by 1.4x
* EF 1.4x III matches the White-tone of the newer L-series lenses.
* Electronic contacts transfer lens information to the camera.
* Image Stabilization still works with compatible lenses.
* In-Camera lens correction recognizes Extender when matched to specific lenses.

* With certain recent bodies and lenses, activates more AF points at f/8 than default f/8 coverage. For example, with 100~400 II on 5D Mark IV and 80D. This is a really significant benefit.

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The CONS:
* Not inexpensive.
* Only works with SOME lenses (Telephoto).
* Can no longer be stacked with EF 2x III without a 'spacer'.

This is not the fault of the 1.4× III but of the 2× III. You can stack the 1.4× III with the 2× II.

* Magnifies any lens flaws.
* Reduces image Contrast.

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