Stay out of their way
Who knew this column of ants you've been documenting was so touchy? One caterpillar strays into the path and the next thing you know it's being carried off with the stream. Better to get the dramatic close-ups from a little distance. This Sigma Photo 150mm f/2.8 macro telephoto is an excellent choice for getting great nature shots without spooking your subjects. With a nearly silent Hyper-Sonic Motor powering the precise autofocus, it'll almost be like you're not there.
It belongs in your camera bag too
While this macro lens is optimized for full-frame cameras, APS-C cameras can benefit as well. The focal length will increase by a factor of 1.5X on most APS-C cameras (1.6X on Canon's APS-C models), so this 150mm lens will have a 225mm equivalent length on many non-full-frame cameras. With three separate mountings to choose from, this lens has the versatility to find a home in almost any photographer's bag.
Carefully machined low-dispersion optical elements and proprietary coatings yield a lens that is sharp, clear, and free of artifacts like color fringing, ghosting, flaring, and distortion. And built-in optical stabilization reduces the effect of shaky hands on pictures with slower shutter speeds.