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There is/was an EF 55-200 USM lens, but it did not have IS. There is no EF-S 55-250 USM lens, but two versions (both pretty much the same) of the EF-S 55-250 IS
I have the EF-S 55-250 IS I (first version) and it is a very good lens for the price.
Perhaps posting links to the actual lenses we can take a look.
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