EF1.4X III: EF2X III: EF 135mm f/2L USM: 189mm f/2.8: 270mm f/4: EF 180mm f/3.5L Macro USM:

Currently, this teleconverter can be picked up for around £275, which isn’t quite bargain-basement territory, but is still less expensive than Canon’s EF Extender 2x III, which costs £300

I still think the 100-400L (which works great with a 1.4x, although still limited) is a great medium cost way to get to super telephoto lengths. "Medium cost" is definitely a relative term, but most agree it's reasonable. Tazz93's gear list: Canon EOS-1D Mark II N Canon EOS 5DS Canon EOS R5 Canon Extender EF 2x II Canon EF 70-200mm F2.8L IS II
It will depend upon the lens (only compatible with certain fixed focal length lenses). See the specifications HERE. And also do look here: EOS 90D Supplimental Information (search that PDF for 2x). It will show all the compatible lenses along with what group the camera will clasify things (A, B,
EOS R7 Comparing RF lenses at similar focal lengths in EF & RF Lenses 11-16-2023; 35mm f2 usm vs 35mm f1.4L? in EF & RF Lenses 11-16-2023; Mount Adapter EF-EOS R question about compatibility with Extender EF 1.4x III in Camera Accessories 11-14-2023; Interesting EF 400 f2.8 IS II issue - EOS-1D X Mark III rendered unresponsive in EF & RF Lenses
Here is a look at the Canon EF 70-300 L with EF 2x III Extender ISO 12233 image quality. Wide open, the results with the 2x installed are remarkably close to the performance of the 1.4x III, but more sharpness/contrast degradation is apparent - especially in the center of the frame.

Here’s a chart showing the Canon lenses that are compatible with the Yongnuo teleconverter: Like the recently launched Canon 50mm f/1.8 clone, Yongnuo’s version appears to have pretty decent

(Max. dia. × length): EF1.4X III: 72.0 dia. × 27.2 mm / 2.8 × 1.1 inch EF2X III: 72.0 dia. × 52.7 mm / 2.8 × 2.1 inch Weight: EF1.4X III: approx. 225 g / 7.9 oz, EF2X III: approx. 325 g / 11.5 oz Case: EF1.4X III/EF2X III: LP811 * All specifications are based on Canon's tests and measurements.
The Canon EF 100-400mm f/4.5-5.6L IS II USM Lens is compatible with the Canon EF 1.4x III and EF 2x III Extenders. As is often the case, the focal length range of the with-extenders combinations is quite impressive with relatively little increase in size and weight. Compatible lens chart (Last Update Date：Decembar 14 2023) Please make selections below. 150-500mm F/5-6.7 Di III VC VXD (Model A057) Product Page. Di III Lenses.
Sonyaddict tamron iii di 20mm rxd group bellow sure instagram follow join twitterTamron 2x af teleconverter for nikon af20n-700 b&h photo video Camera 7d: resource site for canon 7d, 550d / t2i: canon extender ef 2xNikon af-s teleconverter tc800-1.25e ed.
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    • canon extender ef 2x iii compatibility chart