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Release stuck adapter from objective

 
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DavidG1980



Joined: 10 Jan 2017
Posts: 24
Location: Portland, OR

PostPosted: Fri Nov 17, 2017 9:54 am    Post subject: Release stuck adapter from objective Reply with quote

Hi all,
I received a Nikon objective, was mounted on a setup, which included an adapter. The adapter is stubborn and cannot be removed with reasonable force.
I tried to heat the adapter up a bit but it is still stuck.
It looks from the images that the adapter is both female and male ?! strange... anyone seen this?
Any suggestions on how to remove it?
thank you,
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DavidG1980



Joined: 10 Jan 2017
Posts: 24
Location: Portland, OR

PostPosted: Fri Nov 17, 2017 9:55 am    Post subject: Reply with quote

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lonepal



Joined: 28 Jan 2017
Posts: 154
Location: Turkey

PostPosted: Fri Nov 17, 2017 11:33 am    Post subject: Reply with quote

Hi;

It may be cemented ( I hope not).

Squeeze the adapter with a vice (not too much, do not bend the adapter) then try to unscrew the lens with a rubber strap belt spanner.

https://www.ebay.com/itm/Universal-Oil-Black-Adjustable-Rubber-Strap-Belt-Spanner-Wrench-Hand-Tool-Kits/332419908540?hash=item4d65c543bc:g:FHcAAOSwyGZZ6sSX
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Omer
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DavidG1980



Joined: 10 Jan 2017
Posts: 24
Location: Portland, OR

PostPosted: Fri Nov 17, 2017 12:18 pm    Post subject: Reply with quote

The problem is that the outer barrel is released instead of the adapter. Crying or Very sad
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Pau
Site Admin


Joined: 20 Jan 2010
Posts: 4004
Location: Valencia, Spain

PostPosted: Fri Nov 17, 2017 12:38 pm    Post subject: Reply with quote

DavidG1980 wrote:
The problem is that the outer barrel is released instead of the adapter. Crying or Very sad


The first part is good, you can have better grip at the actual objective barrel without damaging the delicate external barrel
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Pau
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DavidG1980



Joined: 10 Jan 2017
Posts: 24
Location: Portland, OR

PostPosted: Fri Nov 17, 2017 12:42 pm    Post subject: Reply with quote

Pau wrote:
DavidG1980 wrote:
The problem is that the outer barrel is released instead of the adapter. Crying or Very sad


The first part is good, you can have better grip at the actual objective barrel without damaging the delicate external barrel



Should i remove the barrel and try?
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Pau
Site Admin


Joined: 20 Jan 2010
Posts: 4004
Location: Valencia, Spain

PostPosted: Fri Nov 17, 2017 2:44 pm    Post subject: Reply with quote

First be sure that unscrewing the outer shell does not rotate the front lens (this is how my Nikon CFI Plan and many others work being the outer sell only decorative.
You wouldn't gain much grip but at least a more solid surface to apply force (with care!)
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Pau
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DavidG1980



Joined: 10 Jan 2017
Posts: 24
Location: Portland, OR

PostPosted: Tue Nov 21, 2017 10:50 am    Post subject: Reply with quote

Thank you guys,
I used some penetrating oil and created a soft jaw pliers from a rubber wrench and a locking jaw pliers, it took me some time since i didn't want to damage anything in the process. The adapter finally caved in and the objective is great.
I did find signs of red threadlocker Shocked this explains the stubbornness of the adapter. Luckily there wasn't too much of the threadlocker, so i was able to release it without applying heat.
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