Wide Angle Lens Help

[Crezzlin]

OK without sounding to stupid

What makes an aftermarket lens wide angle, i have a stock 18-55mm Lens but if i was to get a Sigma 17-70mm f2.8-4 DC OS Lens for Sony would this shoot much wider shots? Going by the 17mm over my 18mm? Or am I missing something? Thanks

 

[Crezzlin]

Hi, thanks i have a Sony A65.

 

[Crezzlin]

Thanks i will look that up now, im just not happy with the stock Sony lens, it could be me but im sure you get what you pay for :s