Graflex.org Forum Index Graflex.org
Get help with your Graflex questions here
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Internal cleaning of Optar Lens front element

 
Post new topic   Reply to topic    Graflex.org Forum Index -> Speed Graphic Help
View previous topic :: View next topic  
Author Message
financephotog



Joined: 18 Feb 2021
Posts: 34
Location: Florida

PostPosted: Sat Apr 24, 2021 4:24 am    Post subject: Internal cleaning of Optar Lens front element Reply with quote

I have some fogging in my 135mm Optar lens on my 4x5 Crown Graphic.

See picture:

https://flic.kr/p/2kUFDgT

The fogging seems to be in between the lens elements. Is there a way to disassemble the lens for cleaning (and then reassemble it)?
Back to top
View user's profile Send private message
45PSS



Joined: 28 Sep 2001
Posts: 4081
Location: Mid Peninsula, Ca.

PostPosted: Sat Apr 24, 2021 9:43 pm    Post subject: Reply with quote

The Optar is a Tessar lens, air spaced elements in front and a cemented pair in the rear. Unscrew the trim ring on the front to remove the front element. The trim ring likely has a threadlocker on the threads that will dissolve with Acetone or acetone based nail polish remover.
_________________
The best camera ever made is the one that YOU enjoy using and produces the image quality that satifies YOU.
Back to top
View user's profile Send private message Visit poster's website
financephotog



Joined: 18 Feb 2021
Posts: 34
Location: Florida

PostPosted: Sun Apr 25, 2021 1:44 am    Post subject: Reply with quote

Awesome, thank you. I will give that a try.
Back to top
View user's profile Send private message
financephotog



Joined: 18 Feb 2021
Posts: 34
Location: Florida

PostPosted: Sun May 30, 2021 11:20 pm    Post subject: Reply with quote

Got it apart!

Used acetone on the thread, then a tool constructed from the ring that screws the shutter assembly into the back of the lens board (which is the right diameter), plus two looped pieces of blue tape wrapped to have sticky sides in both directions.

https://flic.kr/p/2m2ErgV

When putting it back together, is it recommended to put a thread locker on there again? Something like Loctite blue?
Back to top
View user's profile Send private message
45PSS



Joined: 28 Sep 2001
Posts: 4081
Location: Mid Peninsula, Ca.

PostPosted: Sun May 30, 2021 11:45 pm    Post subject: Reply with quote

Use clear nail polish sparingly at 1 or 2 points.
_________________
The best camera ever made is the one that YOU enjoy using and produces the image quality that satifies YOU.
Back to top
View user's profile Send private message Visit poster's website
xmishx



Joined: 23 Jan 2018
Posts: 7
Location: Portland, OR

PostPosted: Fri Nov 25, 2022 4:34 pm    Post subject: Reply with quote

This has been the most helpful info I have found for this dilemma. I hope to have the same result.

Thank you.
Back to top
View user's profile Send private message
gregr



Joined: 25 Mar 2023
Posts: 4
Location: Oregon

PostPosted: Tue Mar 28, 2023 7:43 pm    Post subject: Reply with quote

great work mat. where can I get one?
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    Graflex.org Forum Index -> Speed Graphic Help All times are GMT
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group