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Objective collar stiff / spring stuck

 
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boomblurt



Joined: 18 Aug 2013
Posts: 141
Location: Australia

PostPosted: Mon Jul 17, 2017 8:12 pm    Post subject: Objective collar stiff / spring stuck Reply with quote

I have just recieved an ebay purchase of a Nikon CFN Apo 40x/0.95, as seen at http://www.krebsmicro.com/Nikon_CF.pdf

Although in good condition, the adjustment collar is very stiff - it will rotate but takes a lot of force, and the spring doesn't seem to be working.

What can I do to get the objective back in goood shape please?

Edit: The two rings with knurlings are easily unscrewed, but I'm reluctant to try to remove anything more. The lever that moves the adjustable lens group is smooth. Could it be solidified lubricant between the lens and the casing?
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Geoff
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boomblurt



Joined: 18 Aug 2013
Posts: 141
Location: Australia

PostPosted: Tue Jul 18, 2017 12:45 am    Post subject: Reply with quote

I don't know if this was the right way to go but a few tiny drops of de-solv-it quickly made everything smooth again. I used as little as possible and removed any excess.

Although it works well with DIC, image quality of the 40/0.95 appears similar to the 40/0.70 DIC, although I haven't taken any photos yet so it's just a first impression. My CFN 10/0.45 Apo was a noticeable improvement over the 10/0.30 Ph1.
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Pau
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Joined: 20 Jan 2010
Posts: 4008
Location: Valencia, Spain

PostPosted: Tue Jul 18, 2017 5:49 am    Post subject: Reply with quote

No actual experience with that model. I bough a Zeiss Planapo 40/0.95 that also had the correction collar stiff. I removed just the lower shell and cleaned of residues without solvents nor lubricants. Now it works fine.

The difference between 40/0.70 and 40/0.95 is not so evident at first look, but it is when you get used to the correction collar and with subjects with details small enough like some diatoms. The 0.70 is more forgiving when coverglass thickness and sample thickness are not optimal. I continue using both objecives.
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JohnyM



Joined: 24 Dec 2013
Posts: 166

PostPosted: Tue Jul 18, 2017 6:00 am    Post subject: Reply with quote

If you're into focus stacking... enjoy your new correction collar.
There is a reason why i got 0.7 AND 1.4 lenses, without anything between.

After using solvant, make sure you remove old grease before it gets stuck again. If you wont do that fairly quick, grease will get where you dont want it.
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boomblurt



Joined: 18 Aug 2013
Posts: 141
Location: Australia

PostPosted: Tue Jul 18, 2017 10:48 pm    Post subject: Reply with quote

Just did a few quick stacks of diatoms and see that the 0.95 Apo is clearly better, for both BF and DIC. Although I've seen discussions of NA and coverslip thickness and spherical aberrations it is still surprising how much difference the collar setting makes.
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