ilkka_nissila Offline Upload & Sell: Off
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Yes, but this kind of differences come and go; before these new Sony and Canon lenses, Nikon's 400 and 600 were the lightest, and a while further back, Canon's were. If you have a full system of lenses, the financial loss from a switch could be in the tens of thousands and all the camera and flash controls would be different, and so all the reflexes have to unlearned/relearned, only for a temporary benefit in weight that will be caught up / reversed in a few years, most likely. Manufacturers need to produce competent products but because people use systems, catching up on an individual item doesn't need to happen immediately (each manufacturer has other system components where they have an advantage).
Further, there is the point that Canon allowed the MTFs to drop in their Mk III updates compared to the Mk II lenses (especially the 400) whereas Nikon's FL versions have higher image quality compared to the Canon Mk II's (e.g lenscore.org; resolving power for Canon 400/2.8 Mk II: 1317; Nikon 400/2.8 FL: 1466; this difference is likely to grow with the Mk III since Canon's own data show a slight drop). If you are offered a slightly heavier lens (but still much lighter than historically typical for a 400/2.8) that offered superior image quality, or a lighter lens that isn't quite as good, some photographers will prefer the best quality they can get. And then there are those photographers who will choose even greater weight savings (along with some IQ and speed loss) and prefer the 300/4 and 500/5.6 PF Nikkors.
All of these considerations affect system choice, but then there are lots of other factors as well. One does not typically choose a single lens in isolation. A nature or sports photographer typically needs a broad range of lenses, cameras and accessories.
Nikon offer both extraordinarily light weight 300/4 and 500/5.6, and very high quality fast teles (some of which are currently heavier than some competing products). The fast telephoto Nikkors from 200/2 up do very well on the lenscore 200 megapixel sensor.
I can understand that if one only needs a long tele and nothing else, then switching might be easier, but at least for me the overall system is important, not some single lens.
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