I repeat, have you ever seen the Canon FD 150-600mm 1:5.6L? What about the price in second hand? A 200-600mm 1:5,6L it is not going to be cheap, it is cheap a Sigma 300-800mm 1:5.6 EX? Even that lens that produces less quality than a Sigma 800mm 1:5,6 EX is quite expensive, so, a Canon L lens...