Hi Bruce: I tried manual focusing just now & then tried AF, still a bit of
squeak, especially when 1st focusing far, then focusing close. I also
hadn't used it in a while; I got preoccupied with some primes I purchased a
while back & hadn't been using this lens. I think it's the lubricant, so
I'm going to send it in for a look-see. Thanks. Cheers, Christine
----- Original Message -----
From: "Bruce Walker" <[email protected]>
To: "Pentax-Discuss Mail List" <[email protected]>
Sent: Wednesday, March 31, 2010 7:27 AM
Subject: Re: My DA* 50 - 135 . . .
Christine Aguila wrote:
squeaks when focusing--as if a little birdie is chirping inside. I'll be
taking it in, to be sure, but any thoughts on what might be causing it to
squeak/chirp? Cheers, Christine
Mine did that for a while. A very faint squeak or chirp, like an annoyed
mouse. I found that the manual focusing friction had increased too. I also
noticed that it would fail to auto focus sometimes when the distance from
where it was to being in-focus was small.
I hadn't used that lens for a couple of months, and after I manually
"worked" the focus barrel a number of times and took the lens out to give
it a workout shooting the noise went away and all has been well since.
I'm guessing that the lubricant was unevenly distributed and the mechanism
was a bit sticky. That would cause the SDM motor to work harder--strain a
bit--and likely caused the servo positioning signals to become more
audible, thus the faint squeaking.
I *suppose* I should really send it in for a look-see, but I tend to
follow the "if it ain't broke ..." folk wisdom.
-bmw
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