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07-26-2013, 11:09 AM   #1
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DFA 100mm 2.8 WR Macro audible noise question

Just received my DFA 100mm 2.8 WR Macro from Adorama. There is noticeable noise (audible) when manual focusing - sort of like hearing the gears turning inside.

This is only my second modern K-mount lens, behind the 18-55 kit lens. The kit lens has a little noise, too, but not as loud.

Just wondering if this is normal and what level of sound should be expected. Thanks!

07-26-2013, 11:20 AM   #2
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There will be a little bit of noise, but because the lens has quick-shift manual focusing, you shouldn't worry about it. If there's significant friction, though, then there might be something wrong with the lens.

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07-26-2013, 11:25 AM   #3
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Hm.. It doesn't seem like it's binding. But it is noticeably loud. I think I'll try it out on the camera and see how it feels.
07-26-2013, 12:13 PM   #4
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I don't really hear much when I turn my DFA 100 macro. Not sure about a different copy. n=1.

07-26-2013, 12:22 PM   #5
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Thanks to both of you.

Mine definitely has noise in manual; but it is overwhelmed by a large margin by the autofocus. And it does seem to turn smoothly when I manual focus.

And wow! Huge upgrade from the kit lens. I feel like I'm finally getting what I expected from my K-30. What a great lens.
07-26-2013, 07:12 PM   #6
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I finally found this thread that describes exactly the sound I am getting.

https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/136463-questio...ocus-ring.html

He also posted this video with the sounds (many thanks for that!). http://www.flickr.com/photos/morningthief581/5520072335/

It seems like the consensus here and on that thread is that this is normal. If anyone disagrees, I'd be grateful to hear whether I should exchange the lens.

Also, is there a place here to post lens or camera "quirks" like this, so that newbies like myself can determine whether something is normal or not?
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