Canon Ef 40mm F/2.8 STM

The Canon EF 40mm f/2.8 STM is a highly praised, ultra-compact "pancake" lens. Known for its incredibly small profile and excellent optical performance, it is an ideal, lightweight "walk-around" lens for full-frame and APS-C Canon DSLRs. It is also fully compatible with Canon mirrorless cameras (like the EOS R series) when used with an EF to EOS R