Nice shot! hhahahaa, so it's a battle you're after? hahaha ok, i'll sell my Nikon 105mm VR macro and keep using this one then =)
MY new AF-S VR macro lens costs almost $1000 and this little cheapie cost me $30 with a camera on ebay and it's built better and is just as sharp! it's a great little lens! i wouldn't worry about loosing sharpness with extension tubes... the shot you took above would have been much sharper had you not stopped down so much... this lens (And all lenses) suffer from diffraction, what this means is that the more you stop down after a certin point, you loose sharpess... try to use this lens between f/5.6 and f/11 for best results... at f/32 when focusing closely, you are technically at something like f/56.... i.e. you are REALLY sufferning from diffraction...
try it... get out a tripod, get a shot at f/3.5 and bump up the apperture by one stop and tale a pic each time, you will see that the sharpness it tack on reight up till f/11 or f/16, then it plummets and becomes trrible when you hit f/32...
The universe in a spoon - how very perfect! This is a lovely shot. Nice job with focus, lighting - everything. Congrats on the top ten and personal best!
If I were a betting man...I would say this is Olive Oil shaken briskly and buoyed on water then possibly frozen. I come to this by looking at the small captured bubbles inside the gold bubbles and then the slight waviness of the white area on the right from freeze distortion. However that look also could be from movement of the oil. I think Oil because of the thickness of the edge of each globule. Notice it's thicker on the smaller bubbles which indicates that the surface tension is greater than the pressure applied by the dispersion weight of the oil. Fantastic Photo...7