Go Back   Rangefinderforum.com > Cameras / Gear / Photography > Classic Film RangeFinders & Other Classics > FSU Former Soviet Union RF

FSU Former Soviet Union RF This forum is for the Former Soviet Union rangefinder cameras, especially the many and various Fed, Zorki, and Kiev.

Reply
 
Thread Tools Search this Thread Display Modes

Stain under front element. Helios 44
Old 4 Weeks Ago   #1
robertofollia
Registered User
 
robertofollia's Avatar
 
robertofollia is offline
Join Date: May 2007
Location: Laredo (northern Spain. Wide beach and nice weather -when it does not rain, you know-
Posts: 42
Stain under front element. Helios 44

Dear all,
maybe this should be in SLR, as the lesn is from a SLR, but the provenance -imho- makes it more suitalbe as there are more experts in this subforum. Feel free to move it somewhere else if you consider it approppiate.

After 3 years of continuous use -or abuse- my trusty Helios-44 has developed this -don't know how to call it- stain under front element
image host url
[url=https://postimg.cc/jnw8Qz2K][/url]
Does not affect quality of image but.. I'd like to get rid of it
I would say it's not fungus, but I've got the doubt about delamination or, simply, oil separating from grease that found its way where it should not be.
So there goes my question
If it's oil it should be cleaned. But can it be cleaned?
I mean, it's just a matter of taking out front element.? ( I mean I hope and guess won't have to separate any glued or cemented elemen ts, in that case it would be a definite no-no)


I would be very grateful if somebody could enlightnen me about that stain and how to get rid of it
Best regards
Robert
  Reply With Quote

Old 4 Weeks Ago   #2
Barry Kirsten
Registered User
 
Barry Kirsten's Avatar
 
Barry Kirsten is offline
Join Date: Mar 2018
Location: Brookfield, Victoria, Australia
Age: 76
Posts: 67
Hello Roberto, It's a bit difficult to be certain from the photos but I'm inclined to think that it is fungus. There aren't the characteristic threads usual in fungal infestations, but separation is quite different and doesn't have the appearance the inner patch has. Whatever it is, if you want to get rid of it the only way is to separate the elements, clean and re-cement them.
  Reply With Quote

Old 4 Weeks Ago   #3
Brambling
Registered User
 
Brambling is offline
Join Date: Feb 2016
Location: Ukraine, Kharkov
Posts: 147

this is hardly a gluing.
  Reply With Quote

Old 4 Weeks Ago   #4
Ricoh
Registered User
 
Ricoh is offline
Join Date: Feb 2014
Posts: 201
Aren't the lenses so cheap and readily available to make junking and replacing a sensible option.
  Reply With Quote

Old 4 Weeks Ago   #5
Barry Kirsten
Registered User
 
Barry Kirsten's Avatar
 
Barry Kirsten is offline
Join Date: Mar 2018
Location: Brookfield, Victoria, Australia
Age: 76
Posts: 67
Quote:
Originally Posted by Brambling View Post

this is hardly a gluing.

True! I should have remembered as I've had mine apart. I'd say it's fungus then. Sure these are cheap but if it is fungus it could be removed at little or no cost. Be careful of the coatings though.
  Reply With Quote

Old 4 Weeks Ago   #6
robertofollia
Registered User
 
robertofollia's Avatar
 
robertofollia is offline
Join Date: May 2007
Location: Laredo (northern Spain. Wide beach and nice weather -when it does not rain, you know-
Posts: 42
Thank you so much for your valuable replies, especially for the cross-section.
Being front element alone it will be a matterof unscrewing name plate and after unscrewing retainer.
I will use D. Leitz's formula (WW 1 time) receipt, that is ammonia+hydrogen peroxide (I badly worte demineralised water), at 50%. This gave me excellent results with lenses really contaminated with fungus .
Wil come back with the results
Best regards and thank you
  Reply With Quote

Old 4 Weeks Ago   #7
Barry Kirsten
Registered User
 
Barry Kirsten's Avatar
 
Barry Kirsten is offline
Join Date: Mar 2018
Location: Brookfield, Victoria, Australia
Age: 76
Posts: 67
Roberto, it's not difficult to get the lens apart. But the front nameplate doesn't unscrew. In my 44M-7 it is made of plastic and clips in with several 'prongs' which will probably break off when you try to remove it. When re-assembling the lens I had to use Blue-tack to secure the plate. It works and nobody would know the difference. This is just one example of the mechanical crappiness of these lenses. Mine had a sticky iris when I bought it and after many hours trying to make the aperture work freely I had to give up and set it as a fixed f/4 lens. But it's optically beautiful and produces lovely out of focus backgrounds. The ammonia formula seems right to me and can't do any harm. Good luck with the cleaning.
  Reply With Quote

Old 4 Weeks Ago   #8
robertofollia
Registered User
 
robertofollia's Avatar
 
robertofollia is offline
Join Date: May 2007
Location: Laredo (northern Spain. Wide beach and nice weather -when it does not rain, you know-
Posts: 42
Dear Mr Kirsten
Yes, my 44M-6 is like yours, what intrigues me. Nearly all 44ms I have seen had he screwed nameplate made of alloy, but yours and mine have the plastic 3-prong type, clipped (yes, mine broke one prong, too). That make sme think... is it a 44m-4 and during these "hard times" (after the USRR collapse) did somebody change the name plate for the 44m-6 just to make them look more valuable?
We will never know.
Tomorrow I'll try to take apart front element and come back with the results
Best regards
  Reply With Quote

Old 4 Weeks Ago   #9
robertofollia
Registered User
 
robertofollia's Avatar
 
robertofollia is offline
Join Date: May 2007
Location: Laredo (northern Spain. Wide beach and nice weather -when it does not rain, you know-
Posts: 42
Update from today. front element looking pristine. At the first contact with ammonia, just before Imixed it with Hydrogen peroxide, the fungus or whatever it was, vanished. I used a demak'up pad very gently. After that rinsed it with water, let it dry and cleaned with a microfiber optical cloth. So lens looking pristine again.
Thank you all for your advice.
Best regards
  Reply With Quote

Old 4 Weeks Ago   #10
Barry Kirsten
Registered User
 
Barry Kirsten's Avatar
 
Barry Kirsten is offline
Join Date: Mar 2018
Location: Brookfield, Victoria, Australia
Age: 76
Posts: 67
Well done Roberto. I'm glad it worked out for you. Optically these are beautiful lenses.
  Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -8. The time now is 06:17.


vBulletin skin developed by: eXtremepixels
Powered by vBulletin® Version 3.6.8
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.

All content on this site is Copyright Protected and owned by its respective owner. You may link to content on this site but you may not reproduce any of it in whole or part without written consent from its owner.