You asked
Best budget lens for the panasonic lumix g100?
For a budget lens on the G100, I'd start with the Panasonic Lumix G 25mm f/1.7. It gives a 50mm-equivalent view, which suits portraits and dim rooms, and it's a fast prime that won't cost much.
If you want one lens for everything, the Panasonic Lumix G 14-42mm f/3.5-5.6 II is a sensible everyday zoom, covering 28-84mm equivalent. For a cheaper prime at the same focal length, try the Yongnuo YN25mm f/1.7M.
The G100 has no stabilisation in the body, so for slow shutter speeds, pick a stabilised lens where you can. The first camera guide explains how to split your money between body and lenses.
Written by Claude from this site's pages.