Gresh, Nikkor 60mm F2.8 micro or Tamron's 90mm F2.8. Both are under $400. The Nikkor is a bit better in terms of build and performance, but the Tamron is a very high value lens.
Reflective objects are tricky. It comes down to controlling light. Avoid flash if possible, and provide light that is even and omni directional. This may require you to use multiple light sources pointed in various directions as well as diffusers to soften the light. There are a lot of lighting products for these purposes, such as soft boxes and shooting "cocoons." Also, be mindful of your shooting angles (sorry if I'm stating the obvious ) With an SLR, you should be able to accurately see how the light is effecting the image, unless you're using flash of course (another reason to avoid flash).
A circular polarizing filter on your lens can help keep reflection/refraction in order too.
Hi
I just got the 60mm F2.8 for my D50 I am quite happy with it but need to work on nailing my setting for optimal pics....here is a sample of one I did a few days ago with that lens.
I don't think you can go wrong with it as I found out is is touted as one of Nikons best lenses.
I have the D70 as well and have been looking for a while to find a good macro. Thanks for the tip len. Any suggestions on settings would be helpful as well. I am having the most trouble with whitebalance.
White balance - use a white tile in the tank or a coffee filter and set a preset White balance. The Nikon manual is actually pretty good and explaining how to do this.
I use a Sigma APO Macro DG HSM 150mm true macro lens and it is great. I was 525 when I purchased it late last year. I had great reviews in the mags, does a true 1:1 macro, and a non-rotating front element while focusing and also has the ability to focus to infinity which allows it to be used as a regular prime lens for telephoto work. Best part is that it is a f2.8 lens so it works great in low light or high light conditions.