When using a telephoto lens with a tripod, it is important to first attach the camera securely. Depending on the type of tripod you have, this could involve attaching an adapter or mounting plate to the bottom of your camera and then connecting that to the head or base of your tripod. Once attached, you should then adjust and tighten all knobs and screws until everything feels stable. After adjusting any settings like ball head angles and panning locks, make sure to double check that nothing needs readjusting before taking your shot. Additionally, when shooting with longer lenses in windy conditions it can be helpful to use weights on each leg of your tripod for extra stability.