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Macro lens for Nikon
I use the Sigma 105 f2.8 on Nikon D70s and D200s and find it is a really good lens. It is fast and really sharp, and although the auto-focus can be a little slow, this is off little consequence in Macro photography. It is every bit as good as the Nikkor version, but only half the price, (at least it is in the UK).
However, don't get carried away with the macro len's ability to focus close. At high magnafications the depth-of-field is very small and its all to easy to end up with photos that are out-of-focus. For most of my aquarium photos I use my Nikkor 17-55 f2.8 at mid zoom. I may capture a lot more than just the subject, but its all in focus and pin sharp, and I can crop to the size that I require without loss of quality.
It is much more pleasing to view a photo with sharp focus even if it has less detail.
Les
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