I have an old Benbo tripod which I have been using for my old 600 mm, f4 Nikon , D500 and the u-shaped Manfrotto tripod head. The lens, body and head together are pushing 20 lb. The tripod is about 8 lb. and is bulky. If we ever travel again I want a lighter tripod that can handle the weight and is more compact. I am fine with old used Carbon fibre ones as the new ones are probably too expensive. Any suggestions as to what would do the job?.