It's an YS-scew-mount adaptor. You can use the lens as a standard m42-lens.
I believe the YS-adaptor is a Sigma thing of the late 70's.
I to have a YS-lens. A 100mm 2.8 Sigma Macro
Ren� van Ginkel
----- Original Message -----
From: <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, May 29, 2001 6:57 PM
Subject: OT: Accura Diamatic YS 135mm/2.8 screwmount lens question
> I was given an Accura Diamatic YS 135mm/f2.8 screwmount
> lens by a co-worker who had sold me a Yashica TL-Electro-
> X. He was under the impression this screwmount lens
> would fit the Yashica which takes the M-42
> (Pentax/standard?) mount lens. This lens, while being
> the same size, seems to have one to many threads on the
> lens and therefore does not properly fit the Yashica.
>
> On the bottom of the lens it says 'YS-AUTO'. I am
> inclined to believe it might be for a later Yashica
> screwmount with Auto functions but can find no info on
> the Accura lenses.
>
> If anyone might know any info on these lenses including
> what mount they might be, I'd be most happy. I will
> probably try to trade for a lens I can use or sell and
> purchase one I can use.
>
> Thanks for any info.
>
> -Mark
> -
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