Somewhere along the way, I think in the 1960s, the 135mm lens for a 35mm camera was touted to be the best thing since portholes on a Buick fender or tail fins on a Cadillac. I always thought it was to short for a real telephoto and to long for a portraits. Then the 70-200 or so zoom showed up and it was great. I always use a prime lens for portraits if I can but sometimes you are in a hurry. Some older zooms are pretty slow and those are what, I think, you find in the thrift shops.But you never know what treasures are out there.