Originally posted by dcmsox2004 Chances are high that it's an okay lens -- it isn't Series 1, but it looks like it was built before Vivitar went plastic.
My guess is the serial number begins with 77, meaning it was built by Kobori. I have a 35-200mm lens built by them and it's decent quality and built like a tank.
Or if you're really lucky, it could be a Komine build -- serial number starting 28 -- or Kiron #22 (though I don't think they made any Vivitar lenses with the A setting, could be wrong about that).
Bottom line -- if you want a 70-210mm range lens, you could do a lot worse.
And the price is right