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Message: <blockquote data-quote="garymh" data-source="post: 1930829" data-attributes="member: 60134">Hi ronh,   I am still around on the forum except now, as you said, I am no longer involved with Leica.  I am, however, still in the business and I am now employed as the UK technician for Zeiss.Here are some comments on a few things being discussed in this thread:The marks you are discussing are on the focussing lens inside the binocular.  I was never told by the factory what actually caused them but I suspect that this optic has a slightly different coating (as it is an internal lens) and that the marks were some sort of reaction.  If the lens is removed it is possible to clean the marks off leaving no damage to the optic.Most of Leicas binoculars and 'scopes had a sticky substance painted on the insides of the bodies.  This is not grease but feels like the adhesive on sticky tape.  It is intended to catch any dust paticles moving around within the instrument.The focussing mechanism of the Trinovid BA and BN was greased and grease is also present on the focussing helicoil of the Ultravid.Gary</blockquote>