Not got the best weather here today so dug out my old sigma 135-400 just to have a play on the sofa,then put it on the D70 a combination I loved at the time.
Anyway the sun kept popping out for a moment and the park is very close so I thought why not,well after returning I know why not,the auto focus is painfully slow after the motorized 120-400,i needed iso 800 to have any hope, the D7000 handles this a lot better and no stabilizing on the lens.
I can say with some confidence advances in technology are helping me,they may not make the picture but they make taking it a lot easier and more satisfying,wonder what the next 10 years will bring.