You asked
Best wide angle lens for the sony a6000?
For the a6000's APS-C sensor, a 10-18mm zoom gives you a 15-27mm full-frame view, which is a proper wide angle for landscapes, interiors and architecture.
My pick is the Sigma 10-18mm f/2.8 DC DN Contemporary. It's the fastest of the 10-18mm options here, and that f/2.8 lets in far more light than f/4 (more on what the f-number means). If you want a lighter, stabilised option from Sony itself, the Sony E 10-18mm f/4 OSS is the sensible everyday choice. For something wider, look at the Sony FE 12-24mm f/4 G, which reaches 18-36mm full-frame equivalent.
Written by Claude from this site's pages.