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,
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 11-12-2023; EF 100-400mm f/4.5-5.6L IS II USM Lens switches to MF mid shoot in EF & RF Lenses 11-10-2023 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. 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. 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 Type of extender: AF availability: EXTENDER EF 1.4x: When any of the extenders shown to the left are mounted on a lens with a maximum aperture darker than F4, AF cannot be used. EXTENDER EF 1.4x II: EXTENDER EF 1.4x III: EXTENDER EF 2x: When any of the extenders shown to the left are mounted on a lens with a maximum aperture darker than F2.8

* 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.

The extender comes with a compatibility chart which essentially lists all of Canon's posher telephoto primes and zooms from 135mm f/2 up. Extenders also multiply the f-stop. The 135mm f/2 becomes a 270mm f/4, the 70-200mm f/4 becomes a 140-400mm f/8. 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. EF1.4X III: EF2X III: EF 135mm f/2L USM: 189mm f/2.8: 270mm f/4: EF 180mm f/3.5L Macro USM: EOS-1Ds Mark III: EOS-1D Mark III: EF 14mm f/2.8L USM: You can also correct RAW images taken with the compatible lens even when the extender is attached.

Extender EF 1.4x III – 72 x 27.2 225 Extender Cap E II – LP811 – – – – – – Extender EF –2x III 72 x 52.7 325 Extender Cap E II – LP811 – – – – – – EF ZOOM LENSES EF 8–15mm f/4L Fisheye USM Filter Holder 78.5 x 83 540 Lens Cap 8‐15 EW‐77 (15mm only LP1219 – – – ‐ –

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

(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.

9oUKuC.
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    • canon extender ef 2x iii compatibility chart