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03-11-2011, 09:28 PM   #1
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Question about 31mm Ltd Focus Ring

Hey all. I just picked up a 31 limited from B&H and I'm a bit surprised by the sound and feel of the focus ring. I used to have a 77, and I don't recall it behaving similarly.

It feels a bit gritty and it sounds louder than I'm accustomed to... it's definitely more audible than either my FA 50 or FA 35. If I rack from min. to inifinity quickly, it sounds kind of like a zipper, just a bit quieter. Is this normal for the 31 limited? Should the ring be quieter? Feel smoother?

I haven't really had a chance to put it through its proper paces yet, but from some limited indoor shooting the quality is everything I expected it to be. I'm just wondering if mine has any construction issues or if the focus ring sound/feel are normal.

Any help is much appreciated. Thanks.

03-11-2011, 11:01 PM   #2
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I just pulled mine out if the protective bag and turned the focusing ring while in my hands. I only hear an ever so slight sound while turning it. I guess it could be be called a "zipper" sound; it is just a slight sound heard while holding it horizontal. Holding it verticle (the lens facing straight up) I do not hear that sound. I never paid any attention to the sound before because it is so quiet.
03-12-2011, 01:42 AM   #3
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+1 My FA31mm is currently mounted on my K-7.

In MF (camera set to MF), the FA31mm ring is smooth and it sounds like a gentle/soft spring. It sounds the same in all directions incl. pointng verticaly upwards or downwards.

I hope that the comment will assist.
03-12-2011, 02:55 AM   #4
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my MIJ FA31mm f/1.8 is fine. When i'm using MF I get a small amount of feedback from the focusing gears, but you would be crazy to object to it. the FA43mm f/1.9 is much smoother but I'm using the Leica thread mount version - which doesn't have any gearing for AF in it.

03-12-2011, 12:59 PM   #5
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Original Poster
Thanks for the feedback all. I shot a brief video on an iphone to demonstrate how audible the lens is. I know this is not real-world usage for the focus ring, but it seemed like the best way to demonstrate what I'm hearing.

Pentax 31mm focus ring demo

Normal? Not normal?
03-12-2011, 01:08 PM   #6
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Yep, mine has a "zipper" sound. One of the lesser attributes of the lens. It takes great pictures though.
03-12-2011, 01:14 PM   #7
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My MIJ version does the same thing. Sounds like production quality has remained the same from MIV to AIV, down to the zipper sound
03-12-2011, 01:31 PM   #8
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yep, completely normal - my AIV one made those noises from day one.

03-12-2011, 01:33 PM   #9
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Thanks everyone. I guess I'm surprised that it's more audible than my other FA lenses. But that's a minor little quibble in exchange for its other attributes. Thanks again.

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