What Camera Lenses Do What

What are the types of digital camera lenses you see the use of all the NFL games on the sidelines with monopods?

What are the camera lenses they use in NFL games? Normally, you only see Canon, for some reason, but what do you think they are using? fixed prime lens 200mm 2.8? 300 millimeters 1.8?

I did my 400 mm f/2.8 or 600 mm f / 4, but of course not at the same time. When I shot MLB, I have my 600 mm on a tripod where the photographers well and 400 mm in monopod

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