In shopping and saving for a better wildlife lens just about every article mentions equivalent focal length and a preference for using a crop sensor camera for wildlife. So I start reading about DX mode on my d800. I also learn in the process that the frame rate is faster in dx mode. Interested in learning more about experiences, pros and cons of using dx mode for extra reach (sort of), frame rate. Would there be the advantages in using a dx body verses dx mode? Thanks again!