Which "budget" lens for night shooting a5000 ?

[zono]

I love night shooting, currently on budget/beginner level with alpha5000 and kit lens (16-50 / 3.5-5.6).

What other lens would you recommend me for this camera?

[Pieter]

Care to tell a little more about your subjects and methods? Do you shoot events, family, intimate portraits, astro. Do you use a tripod after dark, do you mind longer exposures? Do you find your a5000 focusses acceptably fast in the dark, or do you resort to manual focus?