This extender does require a full frame lens (not APS C sensor only lenses). This converter does work on cameras with the smaller sensor, it's the lens that has to be capable of full frame. Within its limits, it works well on both my Canon T3i & 60D with the 70-200mm f4L & Tamron SP 70-300 f4.0-5.6.
p.1 #3 · p.1 #3 · Canon 1.4 Extenders-Version II Vs Version III-Thoughts? The 1.4x III helps reduce CA with older lenses like the 500/4 IS and 300/2.8 IS. In general it's a bit sharper corner to corner. The 100-400 II is a fine lens, so I'd not hinder it with a 1.4x II just to save a few dollars.
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Physical differences. Since the introduction of the 800mm f5.6, Canon changed their off-white color of their telephoto lenses. All the new MKII IS super-tele lenses from Canon feature this new coloring so the MKIII extenders have been updated to match both the color and also the very slightly smoother design aesthetic of these lenses.
06-28-2016 11:47 PM. This lens WILL work with a Canon tele-extender if you do this. (An old trick given to me by an old timer at Canon headquarters). Use a very small piece of tape (preferrably the blue tape used to mask painting on walls) and cut an approx. 3mm by 2mm piece with an exacto knife and stick it to the lens contacts in the back.
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

Ideal for wildlife or outdoor sports photographers, the new Canon EF 100-400mm f/4.5-5.6L IS II USM is an impressive update of the original version of this L-series lens, which was first introduced in 1998. The biggest change in this new version is the upgrade from a push-pull zoom to a rotation-type zoom ring.

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. The Canon extenders (Canon does not make "teleconverters") almost always work with third party telephoto lenses in the EF mount that are compatible with their own maker's TCs.¹ Such telephoto lenses tend to have enough clearance in the back of the lens for the Canon extender to fit.
I used older Canon extenders with older lenses and bodies and was never particularly happy with the photos, and I am not super-picky with respect to technical image quality. As a result, I stopped using teleconverters. With the newest EF 1.4x III Extender, and newer gear, I am very pleased with what I can capture. Here are a couple examples:
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    • canon extender ef 1.4 x ii lens compatibility