Thom has a pretty good review regarding it's use on Nikon cameras
here.
If you're just doing portraits, why not the cheaper
Tamron 28-75mm f/2.8? You won't need 17-28mm a lot for most traditional portraits of children.
The
50mm f/1.8D AF Nikkor and
85mm f/1.8D AF Nikkor are also good choices for portraits.
Quote:
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Or should I just save up and buy the NiKon.
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Usually I answer "Yes", but it's really up to you. When talking pro glass like the 17-55mm f/2.8, you're really paying for the build quality as compared to third party options, not optical quality.