I take three of the most reasonable and popular options of wide angle lenses for the Sony E Mount system and put them head to head to see which one comes out on top.
16mm 2.8: http://amzn.to/2r4ZN4n
Wide angle adapter: http://amzn.to/2pJTyi9
Rokinon 12mm: http://amzn.to/2qekv0T
Sony 18-105mm: http://amzn.to/2qe8kAW
Joby Gorillapod: http://amzn.to/2qEqHjE