If you have some a lot of spare cash floating around, you can buy a 5200mm Canon lens on eBay. It will set you back at least 45k$, the f-stop is 14, and the nearest focal distance is 120, yes: meters. You’ll need 2 strong people to carry the lens, and a SUV to transport it.

To give you a sense of its size, have a look at this photo. At the rear the little blob is a 35mm camera.

A nice little video showing both the lens and some video footage shot with it:

Here’s the spec sheet: