Canon EOS R5 Sigma 50mm F1.4 DG HSM 85mm F1.8 USM Canon EF 135mm F2L USM Canon Extender EF 2x III +16 more 150% for the TC vs 300% without, so neither get The incredible Sigma Super Telephoto 800mm f/5.6 EX DG APO HSM Autofocus lens is also an apochromatic-design lens and is available for Canon EF, Nikon F, and Sigma SA cameras. Sigma 500mm f/4 DG OS HSM Sports Lens for Canon EF. Sigma also offers two 150-600mm zoom lenses. The EF 70-300L is NOT compatible with Canon's teleconverters - they will physically not fit on this lens. If you want to get an extended reach, then the RF100-500L is a brilliant choice for the R5 (at a cost), but if you want to stick with EF lenses, then I can recommend the 100-400MkII or the Sigma 150-600c lenses. Tamron actually makes a 1.4x and a 2x specifically for the 150 - 600 as well as a couple other lenses. A bit spendy for the 1.4 at about $419. I went from the G1 to the G2 version of the lens. The upgrade to the G2 was great. My first copy of the G2 was one of the best lenses I have ever owned in 40 years of photography. I have usually used a Canon 100-400L lens for baseball, or a Sony 70-400G lens if shooting with my Sonys. Under the lights I usually shoot either a Sigma 120-300/2.8 HSM OS or a Canon 300/4 L. The Sigma 150-600C, though, is giving me results that equal or better the 100-400L in these daylight shots. I like the look/price of the 150-600 sigma. How would the sigma at 600 compare to canon at 400 cropped? would the sigma be a lot better? My 70-200/2.8L IS II + 2x TC III at f/6.3 is as good as the 400/5.6 at f/5.6. The Sigma C out-resolves it at f/7.1, but only if other sources of blur (out-of-focus blur and motion blur) are virtually absent. The latest fine lensin our Contemporary line. At just 1,830g, this lens is ideal for handheld photography. this lens boasts incredibly compact and lightweight construction. The highly compact, lightweight version of the 150-600mm F5-6.3 DG OS HSM | Sports lens in our Sports line. When removed from the camera, this lens is easy to carry. The Canon extenders have a nose that needs to be dealt with. Since you've got the camera and lens give it a try - carefully.
Canon EOS 5DS Sigma 120-300mm F2.8 EX DG OS HSM The new Canon 600 f4 L IS III is now 6.6lbs, vs the Nikon 600mm at 8.4lbs. Canon Extender EF 2x III