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
-
This message is from the Pentax-Discuss Mail List. To unsubscribe,
go to http://www.pdml.net and follow the directions. Don't forget to
visit the Pentax Users' Gallery at http://pug.komkon.org .
