I would agree that you're probably looking at saving for a better lens. It might be worth thinking about a secondhand sigma 50-500 or tamron 200-500. Both are reasonable performers at the long end, and will take a TC, although IQ suffers as does AF. I have had 2 sigma 50-500 over the years, and found the lens to be very versatile. Secondhand prices seem to be around £350-400 for the sigma, so you get a lot of reach for your money. An alternative would be a secondhand sigma 70-200 f2.8 with a 1.4 or 2*TC, less reach than either of the other lenses, but a good general purpose lens.
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