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Say, does anyone know or have a recommendation for what type grease
Celestron uses or would be good to use on the focus thimble the
primary mirror slides on?

WG

Hi Wayne, I myself am not entirely sure what Celestron uses, or recommends.

Perhaps the techs at Celestron can give some insight on what to use, or what properties would be desireable.

I myself have been using some of the damping greases that are made by Nye lubricants for various Astro uses (Focusers-Drawtubes-Adapter threads, and others)

This damping grease I refer to comes in various viscosities, is full synthetic, has a very good resistance to outgassing so it won't be detrimental being close to optics, and has a very good temp range of useability.

These lubes are referred to as their Nyogel 744 line, and are typically used for camera lenses, microscopes, binoculars, and other optical devices.

They do indeed make an even more sophisticated lubricant called "Nye Torr", which is suitable also for use near optics in a vacuum (Aerospace, and outer space) with an even greater latitude of temperature range. The Nyogel line though should be quite suitable.

Nye will answer any email questions that you have about their products, and what your intended uses are.

Their small quantities distributor is Tai Lubricants. Hope this helps, Mark

Wayne, I also see your mention on the Mak groups about the use of "Super Lube".
I assume this super lube of which you speak is made (Or distributed) by the Permatex Corp., correct?

I use this lube at work (We carry it in 5lb pails. It is a clear lube, full synthetic, supposedly will not seperate, run, dry out, and is food industry acceptable, right?

I have used this grease myself to rebuild a Byers 58 mount of mine.
While is seems OK for this use (Bearings-Rollerbearings-bushings), I have noticed/observed seperation in the pails/samples I have seen, and I am unsure just how well this lube will perform next to costly optics?
(Outgassing) Mark