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Old Jan 14, 2015, 7:05 PM   #1
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Default Loud focusing on the 12-40

Figured I'd start a new thread for this. So I updated the camera and the lens after first having this problem and thought it went away. The lens was getting stuck in the S-AF mode. Updating the camera, it seems like the issue was solved, the IS system was working, and that I could fast auto focus at all zoom ranges. Then I put the camera in vertical mode (with shutter button down). Still no issue. Then I put the camera in vertical mode (shutter button up - how I normally shoot) and the lens struggles to focus, and I even get a check lens the status of a lens message a couple times.

Has anyone encountered this? I realize most of you with this lens are Em-1 shooters, but this lens should work flawlessly on an Em-5 no?

Last edited by drew881; Jan 14, 2015 at 7:23 PM.
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Old Jan 14, 2015, 7:05 PM   #2
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http://www.dpreview.com/forums/thread/3587890 This seems to be a common occurrence

4) Out of focus scratching, aka focus getting stuck in the twilight zone

I assume this one to be a firmware bug in both my zoom lenses, the 45/1.8 again is not affected. What happens is that when you auto-focus, but release the button before focus was successfully acquired then the focus motor seems to get stuck in some "in-between" state where the lens produces a **constant** scratching or clicking noise that does not stop until the focus motor is moved again. The latter means that either you have to use AF again, move focus manually via focus ring (just switching to manual focus is not sufficient) or zoom (parfocal). The noise signature can be different with every try, sometimes louder sometimes quieter, sometimes not happening, likely depending on where you stopped focusing. Once it happens the sound changes between scratching and clicking depending on vertical angle (pitch), with the 12-50 seemingly doing different changes compared to the 12-40 at same angles.

At first I thought that the focus motor might keep moving while the focus mechanism is "on brake", either to get a headstart on next focus movement or because of a simple bug. But nothing in the above image looks as if there even is a mechanical means of fixing the mechanism. Whatever happens there does not seem to affect the focal plane. At least when I tried to find any minute changes I didn't see any, so the force seems too weak to move the focus elements, but still strong enough to be audible.

Most likely it's just a firmware bug with these lenses, because it all stops once the focus motor is moved properly again and never starts with manual focusing or once AF acquires AF. Anyone with an external power-supply (AC3) via portrait grip might be able to measure whether this ongoing noise/force draws on battery life
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Old Jan 14, 2015, 9:29 PM   #3
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Hmmm... All my zooms are 4/3 and loud... Lol not shooting video I am okay with that although I have a set of external 3.5mm mics from when I thought I wanted to be a "taper" before most bands started releasing shows from soundboard online, if I ever decided to shoot video those would work with the em1.

I have noticed the 5 axis ibis on the em1 does hum a good bit more than the 2 axis ibis on the other Olympus cameras I have used, and as mentioned seems to stay on a short time between focuses/shots, a small price to pay for the excellent capability it delivers...
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Old Jan 14, 2015, 9:41 PM   #4
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Here is a YouTube of said issue. I'm half clicking for focus. Of course I had my camera phone pointing the wrong way so the video is small!

https://www.youtube.com/watch?featur...0g&app=desktop

Note that when I hold the camera vertically the other way, you can hear the quiet whirring of the IS. I've messed around in the other IS1 and IS2 modes. I'll try 3 as well and off I suppose?
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Old Jan 15, 2015, 3:56 PM   #5
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Anyone? The crunching and getting stuck in the focus mode is bizarre, given that it mostly occurs when the camera is positioned vertically, but only on one side.
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Old Jan 15, 2015, 5:11 PM   #6
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...If it were me, I would be exercising a warranty check-out @ Olympus.
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Old Jan 15, 2015, 5:23 PM   #7
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Quote:
Originally Posted by boBBrennan View Post
...If it were me, I would be exercising a warranty check-out @ Olympus.
I agree with Bob, just return the lens, looks something is not right with it.
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Old Jan 15, 2015, 10:03 PM   #8
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Quote:
Originally Posted by MarceloLI View Post
I agree with Bob, just return the lens, looks something is not right with it.
Ditto.
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Old Jan 16, 2015, 10:01 AM   #9
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Yes, doesn't sound normal, at all. I've used the 12-40 plenty with my E-M5 as well as the E-M1 and it works pretty much the same with a couple of exceptions, but not in terms of what you are describing.
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Old Jan 16, 2015, 11:04 AM   #10
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I'm wondering if my contact points are not clean? But then again, my other lenses are working fine. I'm going to try and clean the ones one the camera and the lens and see if that gets me anywhere. Otherwise, it is going back. But it seems so odd to me that this problem really only happens when the lens/camera is tilted vertically.
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