Purchased as an upgrade to the 100-400mm, and it does not disappoint. The 600mm iii is too much glass for me and too large for travel. The 200-400mm with built in TC is heavy. The 400 DO ii is great for wildlife and suitable for some landscapes. It may not be suitable for small bird photography. I have used with the 5Diii and 5Div camera bodies, and with the 1.4 teleconverter. This lens is not small so people will notice it. Sometimes I wish I had the 2.8 for speed, but this is the 90% solution for me. The exceptional image quality is the main reason for having this lens.
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