The quality of the foot is excellent as I have found another leofoto products but the design is a litttle flawed. The plate should extend back about 25mm to allow proper balancing of the lens when using teleconverters on gimbal heads. At the moment, on my 400 f2.8 z tc, the plate is as far forward in the clamp as I would like it but if I add an external teleconverter then I need to push the lens forward and the clamp is then only clamping half the lens foot which isn’t great.