This lens is an EF 50mm f/1.8 II.
Features

* Diagonal Angle of View: 46°
* Lens Construction (elements/groups): 6/5
* No. of Diaphragm blades: 5
* Minimum Aperture: 22
* Closest Focusing Distance (m): 0.45
* Maximum Magnification (x): 0.15
* AF Actuator: MM
* Filter Diameter (mm): 52

Compact and high-performance, standard lens

This is the lightest EF lens of all at a mere 130g, very compact and providing a high-performance for a standard lens.
Its Gaussian optics provide sharp delineation from near to far focusing distances. The color balance is excellent for a standard lens.