Home

Please support mflenses.com if you need any graphic related work order it from us, click on above banner to order!
SearchSearch MemberlistMemberlist RegisterRegister ProfileProfile Log in to check your private messagesLog in to check your private messages Log inLog in

CZJ Pancolar 1.8 / 80mm: Sticky aperture repair
Post new topic   Reply to topic
Home   Equipment Care and Repairs
View previous topic :: View next topic  


PostPosted: Thu Jul 18, 2024 2:52 pm    Post subject: CZJ Pancolar 1.8 / 80mm: Sticky aperture repair Reply with quote
It took me a while to come back here and finish the story I started posting this:
https://forum.mflenses.com/czj-80mm-f-1-8-pancolar-stupid-cleaning-idea-t29774,start,25.html#1581315 .

Meanwhile I moved to another town: just 5 km down the river, but anyway a lot of work.
My sprained left wrist healed, and 6 weeks ago a bicycle accident brought new injuries. A skull-brain-trauma deleted all details of the accident from my memory between the moment the car approached from behind and me waking up (only partially, to be honest) in the ambulance car. After that my right shoulder, right knee and right hand refused to do their respective jobs properly for several weeks.

But I can't complain too much: had I not worn a bicycle helmet, I probably would not post today, possibly forever. Guys: wear helmets when cycling! Period.

So, back to vintage glass. I have repaired and maintenanced around 20 or so vintage lenses since January this year, and so after recovering from the accident I felt confident to give the sticky blades of my Pancolar 80 the required treatment.

Please do not take my following posts as a complete repair guide - they are anything but that. What helped me to do the job is the following video:
https://www.youtube.com/watch?v=yhKxTnQduGM

The video is neither ideal nor sufficient, and many steps are missing, and many technical details are hidden by the lack of optical resolution. Nothing is explained. Many hours of careful trial and error were necessary to fulfill the job for me.

Let me post some pictures of the repair process I took for me as a visual notebook. Maybe they are useful for others, too.

Last edited by simplex on Fri Jul 19, 2024 8:29 am; edited 1 time in total


PostPosted: Thu Jul 18, 2024 2:57 pm    Post subject: Sticky blades Reply with quote
The sticky oil on the blades can easily be seen.


The optical elements.


Blades in naphta bath.



Last edited by simplex on Thu Jul 18, 2024 3:22 pm; edited 1 time in total


PostPosted: Thu Jul 18, 2024 3:02 pm    Post subject: Reply with quote
Aperture parts after cleaning. By the way: the screw driver seen here is the tinyest of my tools: 0.7 mm wide according to the manufacturer (Vessel). I only use it to agitate fragile parts like springs when even my tweezers are too coarse to do the job.




This tiny spring is a bit tricky to install.




Blades and 2 holding rings are reinstalled, but still loose.



Last edited by simplex on Thu Jul 18, 2024 3:24 pm; edited 1 time in total


PostPosted: Thu Jul 18, 2024 3:09 pm    Post subject: Reply with quote
Reassembly of the aperture mechanism is half way done at this point.




A brief look at the 'electronics' here. Honestly, I would not trust this worn out potentiometer too much when used at an analog Praktica like VLC, PLC, or MTL5.




Now the spring has to go over that little hook. Here the tiny Vessel screwdriver helped a lot.



Last edited by simplex on Fri Jul 19, 2024 8:27 am; edited 2 times in total


PostPosted: Thu Jul 18, 2024 3:16 pm    Post subject: Reply with quote
I designed this 'special tool' out of a piece of acoustic foam to fit into the inner tube from the top side to keep the still loose aperture assembly in place when turning the tube upside down to rotate the assembly gently in place.

In the I video linked in my 1st post above, the 'Kamtec' guy did it only with his hands. Honestly: I have absolutely no idea how he did it with that pinpoint accuracy. Probably he repaired a lens more than I did, or even two.




Aperture reassembly done.




Aperture reassembly from back side.



PostPosted: Thu Jul 18, 2024 3:31 pm    Post subject: Done! Reply with quote
Finished #1




Finished #2




Finished #3



PostPosted: Thu Jul 18, 2024 3:37 pm    Post subject: My Pancolar 80 on my Sony. Reply with quote
For the photos I used the full-spectrum LED lamp (around 4,000 Kelvin) which I also use for my repairs as well as general desk work. Given the yellowish reflections, I only can wonder whether there's some Thorium involved in the construction of this glass. Any ideas?




And this is how it looks like on my Sony A7R Mark 2. I already started to love this combo after a few dozen shots. Will post some sample images later to round this story up.



PostPosted: Thu Jul 18, 2024 4:10 pm    Post subject: Reply with quote
Like 1


PostPosted: Thu Jul 18, 2024 6:53 pm    Post subject: Reply with quote
Awesome work! Congrats! Thanks so much for sharing!


PostPosted: Thu Jul 18, 2024 8:24 pm    Post subject: Re: My Pancolar 80 on my Sony. Reply with quote
simplex wrote:
For the photos I used the full-spectrum LED lamp (around 4,000 Kelvin) which I also use for my repairs as well as general desk work. Given the yellowish reflections, I only can wonder whether there's some Thorium involved in the construction of this glass. Any ideas?

[url=http://forum.mflenses.com/userpix/20247/big_12554_16_Any_Thorium_Inside___1.jpg]


Yellow reflections are not an indicator for thorium lenses; this is likely just a result of the chosen coating(s).

Thorium lenses, as they age can develop a warm, light yellow/amber hue when looking through them:

https://en.wikipedia.org/wiki/File:Yellowing_of_thorium_lenses.jpg

https://en.wikipedia.org/wiki/Thorium


PostPosted: Fri Jul 19, 2024 11:51 am    Post subject: Re: My Pancolar 80 on my Sony. Reply with quote
RokkorDoctor wrote:
Yellow reflections are not an indicator for thorium lenses; this is likely just a result of the chosen coating(s).

Thorium lenses, as they age can develop a warm, light yellow/amber hue when looking through them:


Thanks for clarifying!


PostPosted: Fri Jul 19, 2024 12:02 pm    Post subject: Reply with quote
Just two simple landscape shots, a 20 minute walk away from my home, both at f8.

Some boats ...




Remains an ancient castle located at the peak of Drachenfels, on the Eastern shore of the Rhein (aka 'Rhine') River ...



Last edited by simplex on Fri Jul 19, 2024 12:15 pm; edited 1 time in total


PostPosted: Fri Jul 19, 2024 12:05 pm    Post subject: Reply with quote
Some nice blossoms ... (no cropping and no extension tube used here, both around f16).

#1


#2


Last edited by simplex on Fri Jul 19, 2024 12:15 pm; edited 1 time in total


PostPosted: Fri Jul 19, 2024 12:09 pm    Post subject: Reply with quote
Lunchtime for our little neighbours ... I used a 20 mm extension tube here and cropped a little bit in post processing. Used f22 (minimum for this lens) for both shots to gain as much depth of field as possible, regardless any possible diffraction effects. It's hard enough to nail focus anyway.




Focus is not really ideal on that bumblebee, but this is the best out of a dozen shots I managed to get until the little guy was done and left.



PostPosted: Fri Jul 19, 2024 1:36 pm    Post subject: Reply with quote
Some background information here:

https://zeissikonveb.de/start/objektive/wechselobjektive-1970er/carl-zeiss-jena/pancolar-1-8-80.html

S
Post new topic   Reply to topic
Home   Equipment Care and Repairs
Page 1 of 1