Upgrade from Nikon D5200 to D4s?

My friend is going into professional animal photography and I told her that is too big of a jump because the D4s is so big and complicated.

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Canon EOS 40D, or Nikon D70 - for night (low light), medium shots & close-ups?

Canon EOS 40D, or Nikon D70 - for night (low light), medium shots & close-ups?

Read more: Canon EOS 40D, or Nikon D70 - for night (low light), medium shots & close-ups?

Will the 55-200mm Promaster AF EDO LD lens fit my Nikon D3200?

Just wanted to make sure before I purchase.

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