Polarizer.

These two shots were taken with and without polariser. Pardon the sharpness as it was really hard to keep up with the speed pace of those red ants!

This shot, which was taken without the polarizer has obviously captured the reflection of the lights on that wooden plank. I was facing the light and the color was as eaxctly as how it is supposed to be, boring and dull.

Same shot, taken with a Circular Polarizer on. The reflection of the light on the wooden plank has been eliminated, even not completely. The color has been more vivid and nicer.

Wondering why the butt are sharper than the head?

Yeah I like the butt more than the head :p..

My bad.. my bad...