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I had borrowed the Canon 2X, took a picture of an immature eagle in a tree. I did the same with a 1.4 teleconverter, and found that the image was significantly better with the 1.4. This was evident by looking at both the images at the same size. I think this may hold true with other lenses besides the 600 F4 IS. I think you are better off by using a 1.4 and enlarging the photo.
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