Bob_w:
This IS a Nikon forum so you will get a lot of Nikkor raves. "why settle for second best?" will always precede the urging to buy the most expensive lens the writer has been able to afford .... and that can be quite a bit.
Sigma (and any other non-Nikkor lens) will be said to be inferior with quality control issues. When I did my research, it was my understanding that the Nikkor 80-200 and Sigma 70-200 yield about the same IQ, but the Sigma has HSM and the Nikkor did not (i.e., no AFS).
The softness of the Sigma at f/2.8 and 200 mm has been discussed many times before and is evident in the MTF tests. I've noticed it myself in my somewhat controlled tests, but it doesn't seem to be much of a factor in the field. At any other focal length or aperture, it's fine. I'll be glad to upload some pics or you can have a look at some of my old posts.
All my lenses and, in particular, my Nikkor primes are also soft wide open .... it's a standard phenomena.
I don't know anything at all about the Nikkor VR --- I use these for sports, so VR or OS is not that useful and you are looking at a 70% price jump. The thing to check is its native IQ compared to the others and then decide whether you are willing to pay for the name and the VR.
All these lenses are heavy and large.
It sounds like you may or may not need very fast focus. Off-road running doesn't sound like things are whizzing by, so you might be able to get by w/o AFS in the 80-200.
Climbing suggests that
(a) you won't have a tripod
(b) things are moving even slower
(c) weight might be an issue
(d) you may always be at the big focal lengths
This is smelling like the VR if the weight isn't a problem. Otherwise, the Nikkor 80-200 might be a good compromise.
Good luck,
msc
New to this forum so bear with me please.
I've checked back in the postings (about 20 pages' worth) to see if
there is already an answer to this.
I'm looking for a zoom in the 70-200 range for my D70. Current
options are:
Nikkor 70-200 f2.8 VR - very expensive, not sure if I can justify this
Mikkor 80-200 f2.8 - fairly expensive but seems a pretty good lens.
Sigma 70-200 f2.8 - cheapest of the lot (but not by much) but still
good from what I can ascertain.
The main use of the lens is for athletics (off-road running) and
climbing shots.
Your thoughts/recommendations please.