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| p.1 #3 · Tamron 70-300 VC or Canon 70-300 IS (non-L)? |
My only experience is with the Canon 70-300 L IS, and it is a very good performer. The IS is of the latest type, so it works very well. Image quality is very good, even at the long end. Auto focus speed and accuracy is what I would call normal, and compares well to other Canon lenses in this general range. The aperature of 5.6 at the 300 end is slightly limiting when light gets a little low, but the 6D has good performance at high ISO, so your cousin should be all right.
I would suggest that you get something soon, and have her try it out a fair amount before the trip. Much better to learn here and have resources to ask questions than to be learning in Africa.