"The Canon 70-300 L is officially NOT compatible with Canon extenders. This is the only Canon L zoom lens with a widest focal length of 70mm or longer that is not compatible with Canon extenders (as of review time). I've tried mounting Canon extenders to the 70-300 L - and they do not fit. The rear 70-300 L lens element physically hits the Manufacturer description: This extender has been re-designed optically and offers excellent performance with compatible EF lenses (same as the Extender EF 1.4x II). Features a new seven-element design, and same weather-resistant design and anti-reflection internal construction as the new EF 1.4x II. The EF 2x II doubles the focal length of any Yes, but you're asking the wrong question. The Canon EOS EF 2x III will work with the Canon 90D, because it has an EF mount. Except, as others have pointed out, teleconverters are designed to only work with specific lenses. Someone posted a link to the "Supplemtary Information" User Guide for the 90D. Refer to that for a complete listing of Jupio Value Pack: 2x Canon LP-E6NH 2130mAh Battery + USB Dual Charger. $149.25. $199.00. Lenspen - Cleaning Kit. $22.46. $29.95. Buy Canon Extender EF 2X III Teleconverter features EF Mount Teleconverter, 2.0x Magnification Factor, Microcomputer Controlled, Communication Between Lens & Camera, Spectra Coating Reduces Ghosting/ Flare, Protective Designed to double the focal length of any compatible Canon EF lens, the Canon EF 2x II extender telephoto accessory is ideal for sporting events and nature photography. The lens boasts a new seven-element design, along with the same weather-resistant and anti-reflective internal construction as the companion EF 1.4x II 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. Please see the lens and/or camera body manual for full compatibility information with the January/2015 - The EF Extender 2X III is a teleconverter that mounts between you camera and your EF compatible lens to effectively multiply its focal length by two. It does that simply enlarging 25% of the middle of your frame, discarding most of the light; thus reducing two stops of exposure (a f/2.8 becomes a f/5.6). I was using them with the 70-200 f/2.8 IS USM MkII and the 100-400 IS USM MkII zooms and found that the 2.0 extender degraded the results unacceptably - I was using them with Cano 5D IV, DsR, 7DII and 90D bodies. While I have had no issues using the same lenses on the R5 and R6 bodies I have, I have not considered using them with extenders. Vay Tiền Nhanh Chỉ Cần Cmnd Asideway.

canon ef 2x iii extender lens compatibility