The way I diagnose it. The OP is not cured from GAS. He just took a rather strong dose to suppress the symptom however I think the symptom will be back in about 3 months.
The 200-500mm is not in the same class as the other three, how abut adding the 400mm f2,8 or the 600mm f4.0; even the 200-400mm f4.0, then that will be real nice and end of gas.
The 200-500mm is not in the same class as the other three, how abut adding the 400mm f2,8 or the 600mm f4.0; even the 200-400mm f4.0, then that will be real nice and end of gas.