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01-22-2011, 12:52 AM   #16
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Not wanting to highjack this threat, but the DA 21mm I once had wobbled too. So much that, afraid it would fall apart, I finally send it in for repair.
It came back real tight, but it got tighter and tighter while in use, that on certain occasions the AF had trouble with it when going from close to infinity, not vice versa. It went back for repair and was replaced, the new one I got is wobbling too but somewhat lesser and the AF is flying.
I think that there is some wobbling needed to be sure that the AF (screw driven or not) will not be over stressed. To my humble opinion, there are two kinds of wobbling, one due to sluggish assembling and one on purpose for a smooth AF. The trouble is to identify the difference, time will tell....


Last edited by philippe; 01-23-2011 at 04:31 AM.
01-22-2011, 12:59 AM   #17
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QuoteOriginally posted by philippe Quote
I think that there is some wobbling needed to be sure that the AF (screw driven or not) will not be over stressed. To my humble opinion, there are two kinds of wobbling, one due to sluggish assembling and one on purpose for a smooth AF. The trouble is to identify the difference, time will tell....
I agree. I also think there needs to be a little play in some of the lenses like the FA Limiteds as they are all metal and in really hot/cold situations the metal might slightly expand or contract.
01-22-2011, 03:30 AM   #18
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I have silver MIJ version, and it's wobbly too.. but I had the lens repaired by Pentax under warranty for internal damage too...
basically, there are three little pieces of something (ain't sure if it's metal or plastic) that hold the whole front section. One of them snapped in my lens, and was jamming the focusing helicoid. So I had it repaired.

I believe, that if you use this lens hard enough, the front section (the hood and front element) will start to wobble as there are only 3 screws holding the whole thing, and they can come loose....
01-22-2011, 03:53 AM   #19
Ash
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Only the slightest of play on mine, and is smooth in function in every way. A fine piece of engineering.

01-22-2011, 08:32 AM   #20
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Well this is good news! I pretty much thought that this is a normal condition. Especially when the second one turned out to have the same play, maybe even a little more than the first one.

This lens produces exceptional images. That I compare to Leica's color and rendering, but with
more sharpness!
01-23-2011, 10:37 PM   #21
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There was this play on my 43mm 1.9 while I still had it...probably nothing to worry about...
01-24-2011, 01:16 PM - 1 Like   #22
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Hello,

I feel mine ( made in Japan ) is tight , with no wobble at all .

01-24-2011, 05:00 PM   #23
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MIJ FA31mm f/1.8 owner here - no wobble here, and I have had it for quite some time.
01-24-2011, 11:34 PM   #24
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What the heck is this MIJ and AIV business (for we uninitiated, but interested, parties ???
01-24-2011, 11:53 PM   #25
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MIJ = Made (and assembled) In Japan
AIV = Assembled In Vietnam (but the components are made in Japan, I hope so...)
01-25-2011, 12:36 AM   #26
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QuoteOriginally posted by philippe Quote
MIJ = Made (and assembled) In Japan
AIV = Assembled In Vietnam (but the components are made in Japan, I hope so...)
Thanks, Philippe, all these acronyms get confusing at times
01-25-2011, 02:36 AM   #27
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MIJ owner since start of December 2010. Only been using since Christmas as present to myself. No discernible irregular movement at all. As Ash noted, a fine piece of engineering and a lens which I can't see myself ever parting with. The weight balance on camera feels perfect in my hands and most importantly the image quality (when I'm not hindering) always brings a smile to my face.
01-26-2015, 01:34 PM   #28
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QuoteOriginally posted by wlachan Quote
I have come across at least 4 MIJ samples and they all showed this characteristic. Just the way the lens was put together. Nothing to worry.
Sounds I should not worry this issue. My new copy has a slightly wobble on the hood section but it has very impressive sharpness at max aperture. My previous copy hood is firm but has disappointing de-centering issue. So I stopped for further exchange...
01-28-2015, 07:13 AM   #29
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AIV - ever so slight wobble, but I hadn't noticed until prompted to look for it. My first prime; I love this lens! So much, that I may have to buy another prime today... Maybe a DA 70 F/2.4...
01-29-2015, 07:38 AM   #30
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FA31 AIV (Silver): No wobble, not even a slight one. Perfect images. +2 on K30. Nil adjustment on K3
FA77 MIJ (Black): Aperture ring has some play when induced. Perfect images. Nil adjustment on K30 and K3.
FA43 AIV (Black): No wobble, not even a slight one. Can produce perfect images on K30. +4 on K30. Perfect images and nil adjustment on K3.
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