Pancake Canon EF 40mm f / 2.8 STM + cap Objective E-52 + Anti-Dust Cap E (Accessory)
Interesting focal even used with APS-C sensor, this makes a 64mm portrait lens for example. With a full frame, taking a step back, we have a pretty decent little great angle with an aperture of 2.8 and beautiful "bokeh". Other advantages, weight