The 400/5.6 is a wonderful lens. It is lightweight and easy to handhold making lack of IS something less of an issue. I wrestled with the choice between it and the 100-400 v. 1 when I bought it about 5 years ago and have never regretted the choice. It is still my go-to lens for BIF even though I now own the 500/4. Even nicer is the fact that you can get one used for well under half the price of the new 100-400 v. 2.
One of the initial downsides of the 400 was the fact that I couldn't use it with a TC on my 7D and get AF. That problem was solved with the purchase of the 7D Mk II. The AF of the 400 with a 1.4x TC is very good (albeit not as fast as the bare lens).
That said, I've been seriously eyeing the new 100-400. The optics and focus mechanism are supposed to be far improved over the previous model putting it on a near par with the 400 prime. The zoom would be nice as I used to use a Sigma 100-300/4 lens for my zoo lens and have missed the range since I sold it a while back to buy the 70-200/2.8 II.
Given a budget, I would not hesitate to recommend the 400/5.6.
One of the initial downsides of the 400 was the fact that I couldn't use it with a TC on my 7D and get AF. That problem was solved with the purchase of the 7D Mk II. The AF of the 400 with a 1.4x TC is very good (albeit not as fast as the bare lens).
That said, I've been seriously eyeing the new 100-400. The optics and focus mechanism are supposed to be far improved over the previous model putting it on a near par with the 400 prime. The zoom would be nice as I used to use a Sigma 100-300/4 lens for my zoo lens and have missed the range since I sold it a while back to buy the 70-200/2.8 II.
Given a budget, I would not hesitate to recommend the 400/5.6.
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