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The Canon EF35-70mm f/3.5-4.5 is an EF mount wide-to-normal zoom lens. It is one of the first lens in the Canon EF series.
At October 1988, Canon announced the EF35-70mm f/3.5-4.5A lens. This lens has similar physical values, but was sold at lower price.
References
Canon EF 35-70mm lens Wikipedia(Text) CC BY-SA