What are the names of those cameras that usually shoot scenery outdoors? They are long and big! Is it a camera or a video camera? Which brand is better? Nikon

First of all, it's not a camera or a video camera. It's called a camera. As you said, it should be a SLR with a telephoto lens.

Then a good telephoto lens is very expensive, because the larger the aperture, the more difficult it is to manufacture a lens with high transmittance and low chromatic aberration;

Then the signature products of landscape photography are D8 10 of Nikon, 5Diii of Canon and A7R of Sony.

As for the choice of brand, just choose from the ones I mentioned above; If it is purely commercial shooting, then it is not a SLR shooting, but a digital back, which is basically a Freescale product;