I have a Tamron 2x 7Element AF teleconvertor and its not noisy, it does hunt
a little bit more than with out it, i use it mostly on an FA*200/2.8.
Is the Kenko one you picked up a 7 element or 4?
Regards,
Paul Jones
----- Original Message -----
From: "canislupus" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, September 19, 2001 8:21 AM
Subject: TC - Kenko AF 1.5x - Slooow and buzzing AF?!?
> Hi,
> I found today the SHQ teleplus Kenko AF 1.5 convertor for Pentax AF
> for a great price used, close to 25$! in near-mint state. I tried it
> out on my current only AF lens, F 1.4/50 and SFXn af body, and it
> produces awfull whirring/buzzing sound when AF-ing! This sound
> (only less high-pitched) is porduced even if manually focusing (as
> the gears inside the TC still move). Is this normal?
> Also, it AFes strangely - overfocuses about 20% distance than focuses
back
> right on. A new AF 1.5 SHQ was the same! A sigma AF 1.4x was even
> worse - couldn't af at all! It just hunted, overshot, again, than
> maybe it caught focus on 5th try. And with the 1.5x kenko, AF is
> veeeeery slooow! About 2 seconds from closest to infinity - the
> ring rotates much more slowly than without the TC. Is this normal
> too? Is my SFXN's af motor just plain sloow? It drives the 1.4/50
> without TC just fine (of course much more slowly than Z1p I tried
> out one day).
>
> I planned to use the TC for manual focus lenses anyway, and it's
> fine for that (all A pins, modern multicoating, ... for 25$). It
> works very fine for manual focus on an old Pentacon 4/300 or Sonnar
> 2.8/180. But someday, I will perhaps have a more modern AF body
> with other AF lenses than just 50mm, so I would like to know if
> this TC is slow and buzzes with any body and lens or just mine old
> body (SFXn <g>).
>
> Thanks!
> Frantisek
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