![Quote](images/misc/quote_icon.png)
Originally Posted by
ChadS
@HDNitehawk you are correct. I'm comparing the results of a 2x crop of the 70-200 @ 200 to a 100-400 @ 400. When I did this with shots from my son playing football the results were very similar. Perhaps the 100-400 had a bit of an edge but not by much - certainly not by the factor of two that one would expect if each lens were equally sharp (as a fraction of the sensor). Again, it's likely the problem was lack of AFMA on the T2i.
A 70-200 f/2.8 II + TCs is $2.6 or $3k (for both). That's quite a bit more than just the 100-400. If you're also adding in a 400 f/5.6 to the comparison then I'd say that's valid. I wonder what the AF speed comparison is vs. the prime.