I am going to the Galapagos in Aug.I lug around and handhold a 300mm 2.8 VR (420 w/ TC14E, 610 w/ crop factor + TC14E)With the D700 can I now get a slower, lighter lens and shoot at a higher ISO?Are better sensors allowing us to get around the physics of needing to have pounds of glass to get good birds in flight?I could sell my 300mm right now for enough to get a 80-400mm VR, 70-200mm 2.8 VR, underwater housing, Casio EX-F1, and have cash left over.Pretty tempting..It would be cool if someone could make a web calculator (simulator) for ISO/lens speed/shutter/fstopCE
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