What's better for shooting Wildlife? - Body and lens recommendations

[biting]

So I'm a wildlife photographer. I have a Tamron 70-300mm f/4-5.6 and I'm using the Canon EOS 250D camera. I have already seen a bunch of cameras and I chose the 7D MII to be my next, but should I upgrade to a newer body, or a lens? I've also seen the Sigma 150-600mm Sport and I think it might be a good option, but what do you guys think?

[jrhoffman75]

You didn’t state a budget, but I would recommend you consider the R7. 

[Tronhard]

Definitely - to give advice that is relevant to you, we need to get a budget.  There are many kinds of wildlife, from small and harmless to large and dangerous; also different environments from open spaces to deep bush. These will create different shooting conditions and constraints, so again helpful for us to make useful suggestions. So, can you be a bit more specific please?

[ctitanic]

The Tamron 70-300mm f/4-5.6  is a little bit short for WildLife photography if used in a Full Frame Camera. That's one point to be considered. Also, 3rd party lenses (and even EF lenses) may not work well with any R camera (specially the R7). Before taking a decision I would check the web for people that have used the combination of lens and camera that you will be selecting specially if you go with any R system.

These compatibility "issues" are less pronounced if you pick the 7D Mark II which has been used with the Sigma 150-600 Sport for a long time.

Regarding the Sigma 150-600mm Sport, it's a very good lens when used with any DSLR. Results may vary when used with any Mirrorless camera made by Canon. You must research the web to be sure that people are reporting good results if you pick a Canon Mirrorless Camera. Keep in mind that Sigma does not have an updated compatibility list showing if this lens works with any R cameras.

[March411]

Agreed that the 70-300mm will fall short for wildlife. If you decide to go with the 7D MII the Sigma 150-600mm would be a nice fit.

If you decide to move to MILC later several members here also use the 150-600mm on R series bodies with the Canon EF to R adapter. I personally use the beast on my R bodies, the 60-600mm and I get excellent results but the firmware needed to be updated due to focus shift/lens racking. Once updated the lens performed perfectly.  

If you do purchase Sigma with the intention of moving to an R body purchasing the Sigma dock would be a good investment. I have several Sigma lenses and all required a firmware update prior to operating correctly on my R bodies.