Lubricant for lens thread

[Nodda Duma]

In the optics industry, Nye Damping grease is specifically made for this application. Doesn’t creep, provides proper lubrication and damping (i.e. that buttery smooth movement that we appreciate in a good focusing ring), and — unlike all the other suggestions above — will work without a change in smoothness of movement over all the temperatures we will encounter and over time.

[Pere Casals]

Yes... if we require damping... as mentioned, dry teflon does not do it...

For the rest, dry teflon!

[Bernice Loui]

All lubricants have some viscosity wet or dry. Damping is directly related to viscosity. So, unless the laws of Physics works different in your world, adding ANY lubricant with viscosity will result in dampening.


Bernice

[Nodda Duma]

The damping is easy. Anything will do that. Except dry teflon (which I would not use any dry lubricant near optics unless you like dust on internal glass surfaces). It’s the combination of all the other essential requirements that calls for a specialized product.

This isn’t a hard problem to solve. Don’t use a butterknife as a screwdriver, as they say.

[Pere Casals]

All lubricants have some viscosity wet or dry. Damping is directly related to viscosity. So, unless the laws of Physics works different in your world, adding ANY lubricant with viscosity will result in dampening.


Bernice

Any friction has a dampening effect, but a "damping grease" refers to a kind of non newtonian fluid with particular class of "viscosity" vs speed curve.

http://insidepenton.com/machinedesig...edampinggrease


In theory wet and dry have different laws of physics, dry has a coefficient of friction and the law says that friction force does not depend on speed. For wet conditions force depends on Shear Velocity, linearly for newtonian fluids, and non linearly for non newtonian ones.

Damping is directly related to viscosity.

Yes, viscosity is a constant for newtonian fluids (say oil), in non newtonian fluids (grease) behaviour it's not explained by a viscosity constant.

[Bernice Loui]

I'll play once..

Does this mean you're "lubricating" threads with Ketchup or Corn Starch mixed with H2O ???


Bernice

Yes, viscosity is a constant for newtonian fluids (say oil), in non newtonian fluids (grease) behaviour it's not explained by a viscosity constant.

[Pere Casals]

Does this mean you're "lubricating" threads with Ketchup or Corn Starch mixed with H2O ???

We may try that

...but with some basic knowledge in lubrication we may do a perfect job (https://www.flickr.com/photos/125592...5/47092537484/) with a Norma without having to disassembly it (https://www.largeformatphotography.i...Tech-lube-quot)




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If we just require low friction then a thin layer dry teflon is probably best choice we may find today, but sometimes we don't want bare low friction. A LF example are some friction plates in the SINAR P.

The SINAR P requires an special grease for that, this is Losoid 6308-51D that I guess it is a damping type grease, as it is mentioned in the manual: http://www.galerie-photo.com/manuels...r-verifier.pdf

Losimol brand (Losoid product manufacturer) is specialized in lubricants for mechanics in the lenses, in the cameras and in the shutters: https://www.losimol.de/en/products/#toggle-id-2

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When you assemble your Norma (if not assembled yet) remember that several friction surfaces have to be free or grease, following service manual or do it with dry teflon that won't harm, for this reason a Norma can be generally lubricated with dry teflon but not generally lubricated with grease.

Of course no ketchup and no starch