If you could choose between a fairly good 300mm zoom like a 70-300VR and shoot at the lens sweet spot of 200mm that is recognized as being pretty dam good at that setting in the center, and then cropping the image in post, or buying a none zoom say 300mm but needing to spend far more money what would you do? would the d7100 resolve enough detail to warrant a very expensive lens, that i would still want to crop with, or would it simply be worth using a 1.4 x extender on the 70-300VR?
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