Has anyone who owns the Micro Nikkor 105mm f/2.8 G used extensions tubes with it? How does the lens perform in this case? I'm interested in getting magnification beyond 1:1. Will this help, and are there any issues I should be aware of?
I've used close-up filters on mine, which are basically just magnifying lenses that you can attach to the front. It works, fully stacked I get about 2.5:1 magnification, but you really have to work to recover the sharpness I found.
Nevertheless, as the 105mm can be used with a Nikon teleconverter (no autofocus), that basically means that it will work fine with any extension tube that I'm aware of. Kenko makes a reasonable option that I've seen recommended before. If you're really nervous about it, take your gear into the camera store or have them show you with their display models.