NikonGear'23

Gear Talk => Lens Talk => Topic started by: Bjørn Solberg on July 24, 2018, 10:53:49

Title: Cosina Voigtlander 125mm 2.5 Apo Lanthar repair
Post by: Bjørn Solberg on July 24, 2018, 10:53:49

Bought this http://nikongear.net/revival/index.php/topic,2711.msg39833.html#msg39833  a bargain.

But now I have a (small?)repair issue, the lens is a little loose where indicated on the photo.

(Photo used is borrowed from the seller)

Big issue to repair?

Title: Re: Cosina Voigtlander 125mm 2.5 Apo Lanthar repair
Post by: Erik Lund on July 24, 2018, 11:28:01

Is the whole lens wobbling back and forth or is the focus ring loose, what do mean by loose?


Not a big deal to take it apart,,, just take care.



BTW i'm obviously the previous owner,,,

Title: Re: Cosina Voigtlander 125mm 2.5 Apo Lanthar repair
Post by: Bjørn Solberg on July 24, 2018, 12:37:08

Thanks for reply,

Focus ring is tight only the end part  is wiggling a bit. Maybe it does not affect picture quality much?

Title: Re: Cosina Voigtlander 125mm 2.5 Apo Lanthar repair
Post by: Seapy on July 24, 2018, 16:04:54

If it's just the bayonet mount then they do come loose, just needs tightening up?

Title: Re: Cosina Voigtlander 125mm 2.5 Apo Lanthar repair
Post by: Erik Lund on July 25, 2018, 09:15:18

Then it is most likely the next interface that is loose, below the mount.
It is of outmost importance that these three screws are tightened down, the risk of breaking this inner mount is rather high, it's the achilles heel of the design quite literally.
Three thin L shaped prongs go deep down into the lens and is held down by three tiny screws, tiny for such a heavy lens.
These are the three most famous screws,,,  :o   ;D

You see them clearly in image two in this old thread from or our ancestry site,,,


https://www.fotozones.com/live/index.php?/forums/topic/22738-repair-cosina-voigtl%C3%A4nder-sl-macro-apo-lanthar-125mm-f25/ (https://www.fotozones.com/live/index.php?/forums/topic/22738-repair-cosina-voigtl%C3%A4nder-sl-macro-apo-lanthar-125mm-f25/)


Courtesy of Sten Rasmussen!

Title: Re: Cosina Voigtlander 125mm 2.5 Apo Lanthar repair
Post by: Bjørn Solberg on July 25, 2018, 12:53:34

Thanks, I will post a new reply when the job is done. For time being I`m under the Vagrancy act (repealed 2004 in Norway) as homeless, Jis screwdrivers packed in boxes somwhere.