Andy: Many people get very good results by putting a close up lens on the front of a prime or zoom lens. The prime should give the best results, but zooms work too. If you choose this route, then make sure you buy a high quality 2 element close up lens, to reduce CA. Canon and Nikon make close up lenses. I have used a Nikon 3T on an old Nikon 75-150 F3.5 zoom with good results. However not all zooms work well with a close up lens. And I'm not sure if the 75-150 would work on your D70 as it is a manual lens.
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