Hello board members, I went out today intending to make some nice images of kangaroos. They weren't close enough for the gear I was using, so I expected to crop them. I was using a 300mm F/2.8 Canon lens with their 1.4 teleconverter, with this setup I am restricted to F/4 and the bokeh wasn't as pleasing as I had expected.

Does anyone have any tips using this setup?

If I dumped the tele I could get F/2.8 but then I would need to be closer - I guess I know the answer already - get closer. But wow! how do you do that when everything is fenced!