I've been photographing nature for 20 years. I have used Sigmas, Tamron and the old 80-400. The first thing I did was put a protective lens coating on it. Necessary. Other than that, this lens is so good it's way better than all the others. It's super spicy! I have the 400 F2.8 AF-S 1 and at F5.6 both are very similar in image quality when shot with the D810's 36MP camera and viewed on a high-resolution Retina display at 100% zoom. I'm not talking test charts, I'm talking real close-up shots of bird feathers in the sun! Plus it's got VR, up to 80mm of zoom and a lot less pounds to carry around. Now I only use 400 F2.8 AF-S when I need to add TC for more coverage or I need subject isolation. Yes! this lens is so good! If I could I would rate it 4.99 stars. The autofocus speed is a bit slower than the 400 F2.8. Otherwise it's like Pro-Glass.
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