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My wife has a Nikon D200 and we are discussing a long lens for her to use. Are there any members using either the Sigma 170-500mm or Tamron 200-500mm? Would be interested to know what your results have been like.
I already have a Nikon 80-400mm VR for my own use, and it may be preferable to buy her one of these. We had the opportunity last year to briefly use a Sigma 170-500 and results appeared to be OK, but would like some other user comments.

photograham wrote:I already have a Nikon 80-400mm VR for my own use, and it may be preferable to buy her one of these.

It will be.

Or how many times do you want to buy her this lens?

For the price, the 80-400 will be hard to beat IMO

The Sigma Bigma 50-500mm is great......

look here for shots.... http://www.smugmug.com/gallery/3188300

Second on the 50-500 Bigma. Great lens.

Thanks folks for your comments. We are lusting a bit for that extra length and would still like to hear from anyobe who has the 2 lens mentioned. I have previously seen work out of the 50-500 but that lens range is presently just not needed.