Your glass is the most important accessory (?) you’ll ever buy. Pay about $10K and get a 22×7.8 with an extender and round up a good wide angle adapter.
My favorite lens is a 11×4.7 with ext. and I can shoot in a 10 x 10 room.
If you shoot sports, the long lens is a must. If you shoot intimate corporate stuff, go with a wider, shorter choice.
I bought a 14 x 8.5 Canon internal focus when they first came out around 1994. It cost me $10K and I still use it to this day on my DSR-500 and it still works great.
There are a lot of great B-Stock and slightly used deals out there.
Steve Wargo