Komatsu D50P bulldozer in action (between Cao Bằng and Lạng Sơn, Vietnam)

Yes, this 16-ton bulldozer was moving toward me when I took the photo! Not a good time to trip and fall.

This photo was taken using the 180mm Raynox fisheye extension. The chroma radial shift and the barrel distorsion were later corrected in Photoshop using the Panorama-tools plugin filters.