The Canon EF12 II and EF25 II Extension Tubes are not compatible with the following lenses: • EF 15mm f/2.8 Fisheye (now discontinued) • EF 8-15mm f/4L Fisheye USM • EF 14mm f/2.8L II USM • MP-E 65mm f/2.8 1-5x Macro • TS-E 17mm f/4L In addition, the EF25 II tube is not compatible with the following lenses: • EF 20mm f/2.8 USM Camera / Extender Compatibility Chart for the EF 200-400mm f/4L IS USM Extender 1.4x Extender Model: 1.4x II: 2x II: 1.4x III Please check the Canon website Invest in a good super tele EF mount lens, with an adapter - the following site might offer some choices: Canon EF Mount Lenses - Camera Decision 2. Invest in a Canon EOS 7DII, 80D, or 90D body - the M50 is roughly equivalent to the 80D, and these bodies should be available at a reasonable price as people migrate to R-series bodies. The EF 180mm f/3.5L Macro USM is a telephoto macro lens which offers a maximum magnification of 1.0x. Life-size close-ups can be taken from further away, and at less risk of disturbing the subject (ideal for insects and other wildlife). The internal floating focusing system minimizes fluctuations in aberrations caused by changes in focusing Auto Focus 2.0X Telephoto Lens for Canon, VILTROX TELEPLUS 2.0X Teleconverter Auto Focus Telephoto Extender Lens Converter for Canon EF Mount Telephoto Lens 70-200mm 100-400mm and DSLR Camera 80D 5DII 1 offer from $7.98. Canon E-49 Lens Cap. 737. 5 offers from $7.95. Canon Cameras US RF Lens Dust Cap, Black, full-size (2962C001) 67. 8 offers from $7.50. 2 Pack JJC 52mm Front Lens Cap Cover with Elastic Cap Keeper for Nikon D3000 D3100 D3200 D3300 D5000 D5100 D5200 D5300 D5500 with AF-S 18-55mm Kit Lens and Other Lenses with 52mm Filter Thread. Go to solution. jsteffenson. Apprentice. Options. 08-24-2023 03:32 PM. I have an R5 and an EF 100-400 L lens with a RF-EF converter and would like to try a 1.4x extender. I assume I should get an EF 1.4 extender to mount between the converter and the lens rather than RF extender to mount to the camera and then the converter. MSRP: $220.00 EF 1.4X Extender Read More revealReadMore('#item7 span.long_desc'); OUT OF STOCK EF 2XII Extender Read More revealReadMore('#item9 span.long_desc'); OUT OF STOCK Extension Tube EF 12 II Extension Tube EF 12 II is especially suited for close-focusing with wide-angle lenses. +$8.25 shipping. Free returns. Sponsored. Canon EXTENDER EF 2X II AF Teleconverter for EOS EF From Japan [Near Mint] #542A. Opens in a new window or tab. My real life testing was done to quantify the best combination of speed, aperture, and ISO for the 100-400 Mark II lens on a 70D camera both with and without the 2x extender. The new II lens has amazing image stabilization which will allow you to shoot at the slower speeds required for f11 and lower ISOs. Focus for both the old and new 100-400 BU9h.