There are a few options. I use a Rokinon 14mm T3.1 Cinema Lens. There is a "photographer's" version of the same lens, Rokinon 14mm f/2.8. These lenses are fully manual. The camera will not know that there is a lens on its' mount.
If you pay much more than $300 for one, then you paid too much. They go on sale from time to time a places like B&H Photo Video. There are two versions of the Cinema lens. The optics are identical, but the more expensive one is made of for focus pullers.
The Rok is a great choice but you may be surprised how well your kit lens will do. Try it. And, not wanting an almost useless, the Rok, for other photographic uses, try a better, fantastic, general zoom lens. Example the EF-S 17-55mm f/2.8 IS USM Lens. Yes more expensive but far more useful. You will love how it ups the IQ of your T6 for everything.
I have the excellent EF 24-70mm f/2.8L II USM Lens another general purpose lens but for FF cameras. It took this shot....
Another, outstanding, general purpose lens would be the Sigma 18-35mm f/1.8 DC HSM Art Lens for Canon. It has a very fast, what you want, constant, f1.8 aperture. It also will up your game for all the other photos you take.