Zoom lenses really started to come into their own by the late-1970s and became standard equipment with most SLRs by the mid-'80s. Versatility was the name of the game, with such optics sometimes enabling a photographer to replace up to 3 primes with one lens. However, this was not a free lunch; there were always compromises involved.
Suffers from a quarter-century and counting film and manual focus SLR addiction. Has recently expanded into 1980's AF point and shoots, and (gack!) '90s SLRs. He even mixes in some digital. Definitely a sick man.