What do you call expensive? Can you borrow the Canon 70-300 IS off anybody or even hire one to make sure you do not make an expensive mistake? The Canon is reputedly a sharp lens but you are losing a stop so not sure how well a TC will work although gaining 4 stops with the IS as far as shake goes. I have not seen the Canon in the flesh but it is a so called budget lens and will no doubt be built accordingly.
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