What's the minimum focus distance? If it's short, then adding an extension tube could result in a useful macro lens.
Those shots look pretty decent. I'd process with an S-curve and some added contrast and call them winners. Try some campus squirrels (the fuzzy kind, not the creepy kind) at relatively close range to see if you can get sharp eyes. If you can get sharp eyes, then adding teleconverters is the next step.
Dave
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