Most photographers purchase a lens in the 80-200mm range as their second lens choice and many end up using it exclusively. This is a perfect range and speed for general outdoor, daytime photography and also makes for a very effective portrait lens. The Canon FD 80-200mm f/4 is a ruggedly constructed, two-touch zoom with respectably high optical quality.
The FD-series lenses can be used for full-aperture metering when mounted on any of Canon SLR models including and after the original F-1, EF and FTb models.