Re-cementing lens

RobertoMiglioli

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Hello.

I´v just re-cemented the front element of my Voigtländer Heliar 105/3.5 lens with Canadian Balsam. So far, so good.

How long should I wait untill the balsam hardens enought so I can reassemble the lens? Does heat help?

Thanks in advance.
 

Tom1956

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What method did you use to get it apart?
 
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RobertoMiglioli

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I boiled the lens. They separated in less than 3 minutes. Then I cleaned with isopropyl alcohol.

It was much more easy than I thought it would be.
 

Gerald C Koch

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When I mounted microscope slides with this medium the recommended drying time was 2 weeks.
 

Tom1956

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I've done my share of research on this. Never actually did it yet, but all my research suggests at least 2 weeks if not a month.
 

EdSawyer

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Why use balsam and not a more modern UV-curing cement?
 

E. von Hoegh

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EdSawyer said:
Why use balsam and not a more modern UV-curing cement?
Click to expand...

Balsam is much easier to fix if you make a mistake. Some of the modern UV cements can be a nightmare to take apart. I recemented a lens with balsam I took directly from the tree - so it's free, too!
 
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RobertoMiglioli

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Hi Ed. Because if I do something wrong it will be easy to clean the balsam and redo the job. I don´t think it would be possible if I use modern UV-curing cement.
 
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