WAFKT,


You may want to take in account if you'll be going from the 50D that she currently owns (1.6X crop factor) to the new 1D Mark IV (1.3X crop factor) she will lose focal length. If you get the 300 2.8 it's a 480mm on the 50D but only a 390mm on the 1D Mark IV. The difference is even more pronounced with the 400mm with the difference of 120mm loss. Just something to think about if you're serious about her getting the 1D series.


Fred~