You asked
Best wide angle lens for the panasonic lumix g100d?
For the Lumix G100D, my pick for the widest view is the Olympus M.Zuiko 7-14mm f/2.8 PRO. It covers 14-28mm full-frame equivalent at a fast f/2.8, which is rare at this focal range.
If you want something cheaper, the Panasonic Lumix G 7-14mm f/4 gives the same 14-28mm view, just slower.
For an everyday wide that's easier to carry, try the Panasonic Leica DG 8-18mm f/2.8-4. It covers 16-36mm equivalent, which suits rooms, streets and landscapes.
If you want something tiny, the Panasonic Lumix G 14mm f/2.5 II is a pancake wide that fits in a coat pocket, giving a 28mm equivalent view.
Written by Claude from this site's pages.