You asked

Best wide angle lens for the sony a6300?

For the a6300, I'd look at the 10-18mm zooms first. On this body they frame like 15-27mm on full frame, which is wide enough for landscapes, interiors and architecture.

My top pick is the Sigma 10-18mm f/2.8 DC DN Contemporary. It's the fastest of the short zooms here, so you get more light indoors, and a constant f/2.8 keeps your exposure steady as you zoom.

If you'd rather have a Sony-branded option, the Sony E 10-18mm f/4 OSS covers the same range with a slower aperture.

For a wider reach, the Sony FE 12-24mm f/4 G starts at 18mm full-frame equivalent and goes further than the 10-18mm lenses at the long end.

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