Options. 08-06-2023 06:36 AM. From Canon's product page for the RF 1.4X extender: Note: This extender is only compatible with the following RF lenses RF100-400mm F5.6-8 IS USM, RF100-500mm F4.5-7.1 L IS USM, RF400mm F2.8 L IS USM, RF600mm F4 L IS USM, RF600mm F11 IS STM, RF800 F5.6 L IS USM, RF800mm F11 IS STM, RF1200mm F8 L IS USM. 1-770-333-4200. Description. The Canon 1.4X EF Extender III is a professional grade teleconverter designed exclusively for use with select Canon brand L-Series lenses (focal lengths over 135mm). Extending a lenses focal length by a factor of 1.4x, Extender EF 1.4X III incorporates incorporates careful lens placement and state of the art Re: Canon 7D Mark II, 100-400II lens and 1.4III extender In reply to PK62 • Jul 26, 2018 I just ordered a Tamron 1.4 Pro converter from Adorama for my Tamron 100-400 and Canon 7D MKII and after connecting the converter to the lens and then to the camera body, I get a firmware update warning.
I have the Kenko 1.4 TC and it fits several of my lenses. I find the results very good with the Canon 24-105/4 L IS, the Tamron 90 and 180 macros, and the Canon 70-200/4 L IS. I find the results not so good using the Sigma 150-500 and the Sigma 18-200, using the 5D2 and the 30D. And I've read some not-so-flattering reviews of the Tamron 18-270
Options. 05-13-2023 06:35 PM. I did some testing today comparing the Sigma 150-600 C to the RF100-500 +1.4x extender. With both lenses zoomed all the way (600mm and 700mm respectively). I set the Sigma lens at F/8 and the Canon at F/10, at 1/1000. I adjusted the ISO to compensate for the Canon's smaller aperture.

So the Canon 1.4x EF Extender would make a 200mm focal length more like 280mm. While there can be some image degradation, this does allow for a relatively cheap way to achieve the magnification found in longer focal lengths. An extender is also lighter and smaller than a lens, coming in at only 2.9″ x 1.1″, 7.8 oz. (72.8 x 27.2mm, 220g).

The RF 70-200 f2.8 or f4 is not compatible with the 1.4 or 2.0x extenders. Your current choices would be: RF 100-300mm f/2.8 L IS USM - TC's can be used with full focal length 100-300. RF100-400mm F5.6-8 IS USM - TC's can be used with full focal length 100-400. RF100-500mm F4.5-7.1 L IS USM - TC's can be used 300-500mm only. RF400mm F2.8 L IS USM.
ITa3.
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    • canon extender ef 1.4 x ii lens compatibility