Hi guys. I just ordered a Sigma 50-500mm telephoto lens. I have an Old big bogen tripod with a markins ballhead so I'm good there. I think I'll be using my manfrotto 681 monopod most often and wish to know what type of support I need between the lens and the monopod? I guess I need another ball head and maybe a plate fot the lense? What do you think? I don't know if I can spring for another smaller markins $$$. Thanx jim
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