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12-27-2011, 09:00 PM   #1
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Weird noise when turn on K5 with 35mm f2.4?

Every time I turn on my k5 with my 35mm f2.4 attached, there is a short high pitch sound.

It sounds kind of like lens focusing, but a lot louder (the lens isn't physically focusing).

When I use the 18-55mm kit lens I don't have that noise.

Anyone has any clue about what's happening here?

It makes me very uncomfortable that I feel like I am hurting my camera.

12-27-2011, 09:26 PM   #2
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That high pitch sound is the ultrasonic dust removal. I thought I was the only one to hear it.
It is not dependent on the lens.

Octav

Edit: OK, I should have said "can be the dust removal". It is short, and how loud you hear it may have to do with the lens you use.
Turn off the dust removal from Setting/page 4/dust removal/start up action.

To test how much the Dust removal sound is affected by the lens, I have removed the lens completely and powered the camera. It is pretty loud, I say.

Last edited by octavmandru; 12-27-2011 at 09:34 PM.
12-27-2011, 09:31 PM   #3
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Original Poster
that sounds reasonable.

but i didn't have "dust removal at start up" turn on, and why is it only happening to my specific lens?
12-27-2011, 09:36 PM   #4
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OK, I have edited my first post.

12-27-2011, 09:48 PM   #5
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I have the same lens and the same sound. It sounds like the focus drive gear engaging to me. Only happens when turning on the camera. Other than this sound, the lens is fantastic.
12-27-2011, 09:50 PM   #6
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i am glad i am not the lonely one.
this lens didn't have any problem with my kx, that's why i want to confirm.
thanks for your answrs oct and rex
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