How many shots do you need to take to the top of the football field or the farthest concert? 400 mm, 500 mm and 600 mm? Or recommend it,

As far as I know, the longest lens of Canon is 1500mm, which is not sold in the store, but is customized.

Generally, off-site photographers take 300mm and 400mm lenses, and photographers who focus on interviews generally use 28~300mm as mirrors to walk the world. Ordinary photographers generally don't add these shots, except local tyrants. Generally, there are still many people holding 70~200mm white, so you can take this lens to shoot. If necessary, it will be much more comfortable to add a 2x or 1.4x zoom lens. If you want to take an alternative route, the price is small, you can check the mirror plate with a different brand. Please consider the aperture value while pursuing length, because it is fixed.