I got my new zoomers yesterday and played with them yesterday afternoon. Wow, these are fun fun FUN! But they really do take some getting used to. There's definitely a learning curve to using these. I had to experiment with opening the aperture to get more light, but the depth of field is WAY decreased. I ended up going to f/18 to get everything in focus, but then the light was very difficult. All the photos below are uncropped images taken directly from my camera.
Check out these seeds from Lamb's Quarters:
(f/22, 1/60s, ISO 1600)
And the leaf from Amaranth 'Opopeo' really shows the depth of field.
(f/11, 1/80s, ISO 640)
All the above were taken using the +10 lens filter.