The Series One lenses are plainly marked. The ones you have are not Series one
models. I also have the 75-260 f4.5. It has worked well for me.
Larry
Don wrote:
> I have three Vivitar lenses for my Olympus OM equipment. A 28 mm f2.8, a
> 75-260 f4.5 zoom, and a 75-205 f3.8~4.8 MC macro zoom. I have seen on the
> list that the series 1 Vivitars are the best and even come close to Zuiko
> in performance.
>
> How can one tell if a Vivitar lens is a series 1? There is nothing marked
> on my lenses to indicate one way or another. Are the series 1's marked, or
> does one just have to know?
>
> Thanks
>
> Don Gaikins
>
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