For the money that is asked for him, you can put up with his shortcomings. It can be used as a portrait if it is not possible to buy fixes. Used on 400d and 60d. At 400 he shows himself better. Multipixel matrices are not for him. The far end will often be useless. If you buy precisely because of 300 mm, then you will be disappointed. If you are looking for a replacement kit, I would advise you to take 28-105mm usm.
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Can you provide more context about the word "Discontinued"?
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