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hoanpham
Joined: 31 Jan 2011
Posts: 2575
Expire: 2015-01-18
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 Posted: Mon Apr 23, 2012 9:22 pm Post subject: Voigtlander 40/1.4 focus wobble |
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hoanpham wrote:
I just got the Voigtlander 40/1.4 MC for Leica M mount.
According the seller, the lens is new, but he has no box. Glass is perfect, optical perfect, cosmetically as new, not a mark - but there is a minor issue: The focus mechanism has some wobble when I turn it quickly back and forward between MFD and infinity. It also makes some noise due to resonance friction metal-metal.
If you have your copy of this lens, please check for me if this kind of issue is normal or not.
Thanks. |
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scsambrook
Joined: 29 Mar 2009
Posts: 2167
Location: Glasgow Scotland
Expire: 2011-11-18
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| Posted: Tue Apr 24, 2012 12:04 pm Post subject: |
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scsambrook wrote:
I have a 21mm f4 which has a VERY slight amount of radial looseness. If I hold the focus-lever and move it slightly towards and back from infinity, there's the slightest degree of movement before the lens starts to turn. But it's almost undetectable unless I'm looking for it, and has no effect on how the lens works. The focusing mount feels slightly "dry" compared to my 35/1.7 which has zero looseness anywhere.
The CV lenses seem to vary from sample to sample according to some of the photo-hypochondriacs who anguish over microscopic variations in some forums . . . I have four different CV Leica mount lenses - all feel different but none of them give me any cause for worry. Come to that, all five of my Leitz lenses feel different as well - far more variation too !!!
In your case, it's the amount of wobble that matters. A small fraction of a millimeter (like mine) might be noticeable but won't matter. But if it's moving appreciably more than that, then it suggests a problem.
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Stephen
Equipment: Pentax DSLR for casual shooting, Lumix G1 and Fuji XE-1 for playing with old lenses, and Leica M8 because I still like the optical rangefinder system. |
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hoanpham
Joined: 31 Jan 2011
Posts: 2575
Expire: 2015-01-18
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| Posted: Tue Apr 24, 2012 8:15 pm Post subject: |
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hoanpham wrote:
Thanks Stephen.
I didn't know that there are so different in copy variation.
Mine has micro wobble, but I did a whole day testing the lens, the sound and wobble does not affect the optical quality, and does not affect the focus fine tune. Turning the lens normally (slowly) won't produce any of these issues. The lens is stunning optically but mechanically and build quality, what annoying.
Best regards. |
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Tedat
Joined: 08 Nov 2011
Posts: 800
Location: Berlin/Germany
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| Posted: Wed Apr 25, 2012 11:20 am Post subject: Re: Voigtlander 40/1.4 focus wobble |
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Tedat wrote:
| hoanpham wrote: |
If you have your copy of this lens, please check for me if this kind of issue is normal or not.
Thanks. |
it's not normal.. no noise.. no wobble with my copy.
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Jan
flickr
Sony A7RM2
Contax T*: Distagon 4/18, Distagon 2/28, Distagon 1.4/35, PC-Distagon 2.8/35, Planar 1.4/50, Planar 1.4/85, Planar 2/100, Planar 2/135, S-Planar 2.8/60, Tessar 2.8/45, Mirotar 8/500, Vario Sonnar 3.4/35-70, Vario Sonnar 4.5-5.6/100-300
Carl Zeiss for Rollei QBM: F-Distagon 2.8/16 HFT, Distagon 2.8/25, Planar 1.4/50 HFT, Sonnar 2.8/85
Konica Hexanon AR: 2.8/21, 1.2/57
Other: Minolta F2.8 [T4.5] 135mm STF, Meopta Meostigmat 1.4/70, Tokina AT-X 2.5/90.. and lots of early M42 Yashinon, Rikenon and Mamiya lenses |
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scsambrook
Joined: 29 Mar 2009
Posts: 2167
Location: Glasgow Scotland
Expire: 2011-11-18
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| Posted: Wed Apr 25, 2012 12:24 pm Post subject: |
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scsambrook wrote:
| hoanpham wrote: |
Thanks Stephen.
I didn't know that there are so different in copy variation. [ . . . ] The lens is stunning optically but mechanically and build quality, what annoying.
Best regards. |
All the lenses using the basic body design of the screw thread 21mm, 25mm and 35/2.5 types which I've handled have been very similar in how they felt - the 35/1.7 and 75/2.5 are different and look to have some common parts, and seem to be much smoother. It's a bit irritiating, but no worse than that, for me at least.
When the CV screw lenses came out they were relatively inexpensive for sophisticated, limited market/small scale production lenses and the mechanical variations were easily forgiven or disregarded. Now, the prices have skyrocketed but the build quality doesn't seem to have changed very much.
_________________
Stephen
Equipment: Pentax DSLR for casual shooting, Lumix G1 and Fuji XE-1 for playing with old lenses, and Leica M8 because I still like the optical rangefinder system. |
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hoanpham
Joined: 31 Jan 2011
Posts: 2575
Expire: 2015-01-18
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| Posted: Wed Apr 25, 2012 4:06 pm Post subject: |
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hoanpham wrote:
Ok. I just unscrewed the base of the lens, dismount everything into pieces. The good thing is the lens easily disassembled. The bad thing is i dont know how to put it back... |
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scsambrook
Joined: 29 Mar 2009
Posts: 2167
Location: Glasgow Scotland
Expire: 2011-11-18
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| Posted: Wed Apr 25, 2012 6:12 pm Post subject: |
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scsambrook wrote:
Ohhhhh Dear . . . . . Good luck with it !
_________________
Stephen
Equipment: Pentax DSLR for casual shooting, Lumix G1 and Fuji XE-1 for playing with old lenses, and Leica M8 because I still like the optical rangefinder system. |
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hoanpham
Joined: 31 Jan 2011
Posts: 2575
Expire: 2015-01-18
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| Posted: Wed Apr 25, 2012 8:51 pm Post subject: |
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hoanpham wrote:
Got it back in original shape 
The lens is now so perfect to use. |
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