Most of my shooting for the past month or two has been with prime lenses. When I got into digital photography way back in 2010, I gravitated towards zooms. Good zooms with IS (image stabilization) are OK when the light is low, but there comes a time when a fast prime is needed–and fast primes (I gleaned rather quickly) are yet another photographic learning curve. This guy, unbeknownst to him, helped me while I was experimenting with focus points and shallow depth of field in a very low light situation.
Lens: Canon EF 85mm f/1.8. 1/60 at f/1.8, ISO 3200.
Canon 5DM3 geeking out in low light.