johnctharp Offline Upload & Sell: Off
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While switching fully to Nikon would be effective, it's hard to imagine giving up lenses that are unique in ways that aren't fully replicated in Nikon's system, noting that this does go both ways. But to be specific, it makes more sense to add an A7R for the purpose of landscape shooting, which will adapt equally well to Canon or Nikon glass.
Lens by lens:
1. 14/2.8L II- obviously replaced by the 14-24/2.8G, in every way except for size; note that the Samyang 14/2.8 makes an effective, and inexpensive, alternative.
2. 24-70/2.8 and 70-200/2.8- both are superior in Canon mount, and would shine on the A7R more than Nikon's lenses would on a D800-series body.
3. 100L- better rendering, better IS, and better usage as a telephoto lens than the 105VR. Both are effective macro lenses.
4. 85L II- the 85/1.4G is a faster focusing, sharper, better corrected lens with smooth rendering, but it cannot provide the look of the Canon lens wide open, or the Canon's character. Both provide for excellent portraiture.
Generally speaking, you'll lose value in the switch. Now the A7R isn't cheap of course, and neither are the accessories needed to make it an effective landscape replacement, but it would provide the widest availability of lenses. You'd be able to use Nikon's 14-24/2.8G alongside Canon's 17TSE or 24TSE, etc.
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