Binoculars? If it has a standard tripod thread then yes. But the hight it goes to would mean you would have to sit it use them and I think the legs would get in the way. Better off with a monopod that adjusts to a higher level. 

Yes most definitely. This tripod allows a lot of heights and multi directions 

Yes. Ive had my D500 with nikkor 200-500 on it and its fine. its a great tripod. 

Yes, the ball head is removable. Your fulid head could be used on our tripod as long as it has a 3/8" standard screw interface. 

Yes this tripod is compatible been using my eos 7 mark ii for months now and is great hope this helps  

Yes. The head is the same for all models so it will be the same quick release plate. 

Absolutely, yes. I use a Sony a6400 and its a good sturdy tripod in all conditions. 

K&F Concept 53" compact tripod you are asking, the monopod is taken from one leg of the tripod, could hold your lens and camera,but as your lens is a telephoto lens, If your lens is large or telephoto zoom lens, please ensure to expand the leg angle, and hang some weight to the hook to increase its stability. For camera with telephoto zoom lens, you need to buy a tripod mount ring additionally for better balance.The center column also has a hook to hang weight on to lower the center of gravity on this tripod to make it more sturdy and less prone to vibrations which is awesome for photography where you take long exposures . We care about our customers, any questions, you can ask us directly at gearfocus@kentfaith.com. All emails would be replied in 24 hours, no exception 

If you mean 3 way head, yes, the ball head is removable. Your 3 way head could be used on our tripod as long as it has a 3/8" standard screw interface.