>>348725050mm f/1.8 aka the nifty 50 or plastic fantastic. Use it to enjoy baby's first bokeh balls and general portrait bokeh. It's lightweight and pretty damn sharp around f4.
And for something a bit more wide, check out the pancake 24mm (f2.8) pancake. For me, it was a fun little lens I used for situations when 50 was too tight, I wantes a very light walk about lens on my cam as opposed to my usual 18-135 kit zoom I owned when I first got my cam.
Used it for group shots and portraits with a bit of the environment in frame whereas my 50 was more for faces/bust portraits
