I bought a Canon R8 earlier this year and its AF system has impressed me in being able to lock and track focus on my Border Terrier. My specifc interest/need is in capturing my dog running towards me when we are out and about on walks.
I have had a lot of success, but the best compositions I find are generally when she fills the frame and currently with the lens I use (Canon EF 85mm f1.8); at this point I find she encroaches within the minimum focus distance of the lens (0.85m) (or maybe the camera/lens combo struggles at this point?) and the critical shots are out of focus where it matters i.e. her eyes. Example attached from this morning (focus behind the eyes) - this is from a burst of about 20fps, AF case 1, tracking sensitivity 1 (locked on), whole area AF. This one in particular was shot at f1.8 but I could of equally put an image here as an example where the same behaviour occurrs at higher aperture values. To give the camera some credit, the shots that were OOF on the eyes, the focus confirmation box was not on the eye so at least it isn't giving me false positives which was the case in other cameras that I have tried in the past.

Is there a better EF (or RF) lens that will enable me to get the kinds of shots I am after? I think it needs to be a fast lens, f4 might not be enough in low light conditions/woodlands. I guess one of the EF 70-200 f2.8 options is probably what people will recommend but is there anything else I have overlooked, preferably with fast AF and that is a little lighter/easier on the wallet?
I had looked at the EF 135mm f2 but its minimum focus distance is 0.9m so I'm not sure whether that will be any different albeit the focal length being slightly longer may alleviate the issue. Assuming that its a mfd issue and not a camera struggling to focus that close issue?
I have had a lot of success, but the best compositions I find are generally when she fills the frame and currently with the lens I use (Canon EF 85mm f1.8); at this point I find she encroaches within the minimum focus distance of the lens (0.85m) (or maybe the camera/lens combo struggles at this point?) and the critical shots are out of focus where it matters i.e. her eyes. Example attached from this morning (focus behind the eyes) - this is from a burst of about 20fps, AF case 1, tracking sensitivity 1 (locked on), whole area AF. This one in particular was shot at f1.8 but I could of equally put an image here as an example where the same behaviour occurrs at higher aperture values. To give the camera some credit, the shots that were OOF on the eyes, the focus confirmation box was not on the eye so at least it isn't giving me false positives which was the case in other cameras that I have tried in the past.

Is there a better EF (or RF) lens that will enable me to get the kinds of shots I am after? I think it needs to be a fast lens, f4 might not be enough in low light conditions/woodlands. I guess one of the EF 70-200 f2.8 options is probably what people will recommend but is there anything else I have overlooked, preferably with fast AF and that is a little lighter/easier on the wallet?
I had looked at the EF 135mm f2 but its minimum focus distance is 0.9m so I'm not sure whether that will be any different albeit the focal length being slightly longer may alleviate the issue. Assuming that its a mfd issue and not a camera struggling to focus that close issue?
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