Macro: Extension Tubes and a Special Note on Winter Photography (Two Photographs)
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Macro: A 105mm macro lens will get you close, but it may not get you a safe working distance from your subject while getting you close. This is where extension tubes come in. They allow you to focus closer from farther away with any lens. Extension tubes go between the camera and the lens, they may have the connections that maintain the electronic links with the camera or they may not. Kenko makes a good set, but there are others. While you lose a bit of light, an extension tube allows you to focus closer from farther away. I often use a 12mm extension tube that gets me optically close to the bee but not close enough to offend the bee.
The duck has nothing to do with macro or extension tubes and everything to do with handling difficult lighting situations. Ice and snow show up as bright blue in winter photography unless under-exposed by a couple of stops. The catch is how this affects your subject, it may not look great under exposed, and hence the choice, to do it in camera or in post production. In post, assuming flexible software you can selectively remove the blue. And in case you are wondering, the blue is a result of how the light meter reads the color white (similar things can happen with wedding gowns). In these photos I wanted the ice to show as ice and the steel grey look worked for me.