Tamron 70-200mm f2.8 LD is an Auto Focus (AF) Telephoto Zoom lens with 35mm FF max sensor coverage. When mounted on a 35mm FF sensor camera, it will give you an FF equivalent focal range of 70 - 200mm. With a max aperture of f2.8, this lens is fast on wide end and equally fast at 200mm with a max aperture of f2.8.
Tamron 70-200mm f2.8 LD is not a weather sealed lens, so you have to be extra careful against rain and dust. Tamron 70-200mm f2.8 LD was replaced with Tamron SP 70-200mm F2.8 Di VC USD Canon EF. Follow the link to read our comparison of these cameras: Compare Tamron SP AF 70-200mm F2.8 Di LD IF MACRO Canon EF vs Tamron SP 70-200mm F2.8 Di VC USD Canon EF