Question re polarizing filter

[cerett]

The turning action on my 77mm circular polarizer (B+W) is not very smooth. I would say that it could stand some lubrication. Is there anyway of doing this without risking lubricant getting between the layers of glass and totally screwing things up? Thanks

 

[Rethmeier]

WD-40

 

[cerett]

Thanks; but how do you suggest preventing damage to the filter during application?

 

[johnnygoesdigital]

First try some compressed air in the seam between the two halves. Second, try some graphite lubricant or something similar, but nothing that atomizes in a spray. Graphite can be applied by squeezing the tube, also try cutting the end of graphite tube at a very small and tapered angle.