Re-cemeting lenses : revisited

So I've dev'd the first roll of film since re-cemeting the front

element of my Fed 28mm f/4.5 and the results are spectacular !!

 

I followed the suggestions in the previous posting

http://www.photo.net/bboard/q-and-a-fetch-msg?

msg_id=0092qG&unified_p=1 and pried the mount away from the element

using a suitable tool (thanks , Jani) and it fell into my hand in two

parts ... serious separation !! The old Balsam cleaned off with a

drop of acetone, no problem, this was getting too easy.

 

I'd anticipated re-assembling the lens using new Canada Balsam, I

even bought some, but found the small size of the elements to be too

tricky to handle in a hot environment, so I bought a tube of Loctite

Glassbond and used that. One drop, a few minutes in the sun to cure

it, scrape off the excess around the edge, a quick polish with a

duster, and 15 minutes later the lens was back on my Zorki 6 :-)

 

This lens is a compact little unit, looks like a collapsable

Elmar/Industar etc., but doesn't extend, neither does it protrude

into the camera like the Orion 15, so should be useable on any LTM

camera or M-mount, with an appropriate adaptor.

excellent work! congratulations!

 

:)=

I also use the loctite glassbond, since it is very difficult to find canadian balsam where I live and why use the old method that failed. And when glueing there is no hurry since it hardens only with UV light.

By the way, what tool did you use? Last time I used a kind of a surgical knife.

 

Jani

I think I'm too clumsy to try something like this myself, but it is nice to know that it is possible. I've got a couple borderline Tessars that could really use this treatment. I don't see any apparent way of getting them out of their mount without damage.

Here's a proper <a href="http://www.photo.net/bboard/q-and-a-fetch-msg?msg_id=0092qG&unified_p=1">LINK</a> to the afformentioned thread.<p>I too have a recementing project awaiting some spare time. Anyone here done a triplet?

triplets aren't cemented.

 

Cheers,

 

Dan

My Sonnar has two cemented triplets.

Ah. THAT kind of triplet, not a Cooke triplet. Ain't equivocation wonderful?

 

Cheers,

 

Dan

>> By the way, what tool did you use? Last time I used a kind of a surgical knife.

 

Jani,

 

I used a small (~1mm) jewellers screwdriver sharpened to a blade, like a small chisel, and worked it at an angle under the brass burnishing, so one of the points at the edge did the work, but the whole tool was rigid enough not to bend or snap. Once the initial mm or so was lifted it just slid around the lens peeling the brass back ... easy ;-)

I received a $600 estimate to recement two elements in my Tele Rolleiflex TLR camera. I wonder if I should actually risk messing it up and follow the suggestions given above ...?

Will acetone remove coatings? I have a damaged 300 4.5 Apo Lanthar