I took this for James to see the level of detail capable with the 70-200mm f2.8 plus the Tamron SP2XTC teleconvertor. This was shot from across the Tidal Basin with 400mm. Select Full Size below to see the full detail.
Don, thanks for posting this image. I was looking at a 120-300 with a 2x but I'm a disappointed with the recent price increase. From the results of this image and the ones that I took, I think your 2x is a very good compromise. Thanks again, and I love the gallery.