According to the German K&F concept homepage, the adapter assigned to your question fits all EOS-DSLRs (including your EOS 700D) on the camera side. 

Yes, I use a number of old Zeiss lenses on the EOS 6D and 7D. Since the 700D has the same bayonet, there won't be any problems there either. However, the lenses can only be used in M ​​or Av mode as there is no autofocus. The adapter fits well on C/Y lenses but is a little difficult to remove due to the lack of a release button normally found on Contax and Yashica cameras. 

Hi, Your Canon could be used on our tripod as long as it has a 3/8" standard screw interface. 

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

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