Inner Focus wrote:
> Hello, I'm new on this list. Since I've seen some people curious about Sigma
> plans for the future, I decided to share the following with you.
>
>
>
> I was interested in buying a few Sigma lenses for my Samsung GX-1S, so I
> mailed the USA, UK and France Sigma representatives asking them if they plan
> to introduce HSM on Pentax lenses in the near future. The answers were the
> following:
>
> 1) USA:
> We are not working on that at this point in time. If any changes we will
> make an announcement on our website.
>
> 2) UK:
> At present we have no plans to produce our Pentax lenses with HSM. The
> majority of Pentax cameras cannot take the HSM system. Sigma may decide
> to produce Pentax HSM in the future.
>
> 3) FR:
> A ce jour, cela
> n'est pas prévu.
> (Translation: Sofar, this is not planned.)
>
> Comments are useless... :(
>
> OK, I also have a question: what's the advantage of ultrasonic motors? I'm
> interested in AF speed, since I've had a lot of trouble with my camera and
> it's kit lens (annoying AF hunting or even impossible AF in not-so-low :(
> light).
>
The advantage? Silence. Focus speed, (and hunting), is unchanged.
However all the Pentax SSM, (same as USM AFAK), have wider apertures,
which does make quite a big difference in focus speed and accuracy
> About ultrasonic motors (technical article):
> http://en.wikipedia.org/wiki/Ultrasonic_motor
>
> PS: is HTML formatting of emails allowed on this list?
>
No.
> A.M.
>
>
>
>
>
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