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squeeky sound when mounting filters

Anodising can sometimes be dry so the engineers trick is to put a tiny amount of lanoline on a cloth and rub it into the filter ring threads NEVER on the lens threads. The lens threads may get a build-up of fine dust and tiny skin particles just lightly dampen a clean cloth with water and wipe the threads your be surprised at what comes off.

Our technicians clean hundreds of lenses, never use graphene, grease or any cleaner like WD40 they all leave residue. When we disemble lenses and need to clean parts we use purified water in an ultrasonic bath and a purpose dryer.
 
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