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?
Objective collar stiff / spring stuck
Moderators: rjlittlefield, ChrisR, Chris S., Pau
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.
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.
Geoff
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.
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.
Pau