Dennis-B
Subscriber
This seemed to be one of those lenses in which Vivitar went a stop too far. I have a couple of copies of the 24mm f/2.8, and they're both tack sharp especially around f/8-f/11. I owned a 24mm f/2, and it was so soft, I could use it for WA "dream scenes" when wide open. Kept it for about a month, and off it went .At the risk of being a curmudgeon, the very worst lens I ever purchased was a 24mm f/2 Vivitar lens in OM mount.
Its optical quality was mediocre at best, and it kept falling apart!
I bought it new in Canada, at about the price shown in that ad (IIRC).