I bought a Nikon 70-200 f/2.8 ED VR I last year, but I figured out only too late that it has sharpness issues on one side of the image. My question is what telephoto lens is best for landscapes? All the reviews I see emphasize use for portraiture or sports/wildlife. Is 70-200 the best range, or should I look at a 300, or even the 200-500? Since I plan on backpacking with it, I prefer lighter lenses like the 300, but I'm unsure of the versatility in use compared to a zoom. Thanks in advance!
In my experience, the all-out best telephoto lens for landscapes is the Panasonic-Leica 50-200mm f2.8-4. Easy to pack and travel with, extremely sharp corner to corner across the focal lengths, ridiculous hand holding capability when shooting with something like a Panasonic G9. You can even get 40Mpx images that are every pixel as good as the D810s if the conditions allow it.
Unfortunately, Nikon does not have such a lens. The closest equivalent in Nikon land is the 80-400 VR2, which in my experience is a bit underwhelming, especially for the price.
I for one traded my 70-200mm f2.8 VR II for the 70-200mm f4 VR as the default landscape telephoto lens. And while I really like the lens overall, often I find it a bit short for the types of mountain landscapes I do. The word on the street though is that FX 70-300mm VR AF-P lens is as good as the 70-200mm f4 VR and well... it gets to 300mm and is cheaper. So it might work a look.
Having shot landscapes with the Sigma 150-600mm C I can say that you wouldn't catch me dead backpacking with it (and remember, this is a lighter lens than the Nikon 200-500mm f5.6). While the overall image compression can be fantastic with such a long tele, you will end up fighting various atmospheric disturbances. Plus, you will need serious support to shoot at decent ISO/exposure times and these lenses are optically focused on center sharpness rather than edge to edge sharpness.
Also, I tried landscape shooting with the old 300mm F4D. It is very very limiting due to the fixed focal length.
An option might be the Sigma 100-400mm C that is lightweight and seems to be consistent in sharpness across the frame and focal lengths, but I have not had the chance to try it.
TLDR:
The 70-200mm f4 VR seems to be the best option. An alternative to it, the Nikon 70-300mm AF-P VR FX. Another alternative could be the Sigma 100-400mmC. Finally, the Nikon 80-400mm but I doubt it is worth the money. The big telephoto zooms are too compromised to work when backpacking.