| re: Vivitar Series 1 105mm f2.5 I don't know the current going price for these, but I can tell you what I paid if it helps.
I bought one new-old-stock in the original box with all papers and box, case, unused about 18 months ago from a long-time seller on e-bay who specializes in buying out old stock from closing stores. Mine is a Kiron (serial 22xxxxxxx), Pentax P/K-A mount version. Back then, it was advertised for $250/make an offer, and he accepted my offer of $200 plus shipping. Back then he had about a dozen in all!
It is an absolutely incredible lens, worth every cent. I cannot compare it to the Tamron as I do not have one, but it can resolve to beyond the limit of my K20d sensor and is very flat-field in use, with great color rendering.
If you get one, see if you can find a secondhand Lester Dine ring/point flash, which fits its 52mm filter thread and was designed to work with it. They come up fairly frequently on e-bay. They can be used as a straight thyristor auto gun (with low voltage at the contact) or are pretty easy to modify for multiple switched manual power levels. |