« on: August 05, 2012, 12:52:33 PM »
I had the 100-400 in the past but sold it to get the 300 f2.8. The AF of the 300 f2.8 is superb. Adding 1.4x is no issue either. Yes, cropping is just a fact of life for BIF at 400 mm even with a cropped sensor. The 300f2.8 plus 1.4x is very sharp even at 100 percent.