The EF40mm f/2.8 STM was a standard prime lens which was introduced by Canon in June 2012, alongside the EOS 650D/Kiss X6i/Rebel T4i.

[1] The lens features a maximum aperture of f/2.8.

It was Canon's first EF pancake lens.

The EF 40mm was the first EF lens equipped with a stepping motor (STM).

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