The Giottos MML 3270B Monopod is a 4-section professional class model made from aluminum, with 31/28/25/22mm diameter segments that makes it appropriate for use with the very largest of SLR telephoto lenses, such as 170-500mm professional zoom models, a 300mm f/2.8, etc.
The MML 3270B's maximum height is 5'7", meaning that when the camera is attached it will reach the comfortable eye level of a person as tall as ~6'2".
The MML 3270B has flip style lever locks, which could even be disassembled and cleaned in the field in an emergency situation. The top platform has a spring-loaded and reversible 3/8"-16 or 1/4"-20 threaded camera screw.
MML 3270B 4-Section Aluminum Monopod - Supports 33 lbs (15kg)