Agree with that. It's risky if you spray at a short distance. Regards Vladimir -- Gesendet von meinem Palm Pre Klaus Karcher <lists@xxxxxxxxxxxxxxxxx> schrieb am 24.04.2010 20:21: Ernst Dinkla wrote: > The cone will be taken off the instrument before the cleaning. It is a > simple part with a 0.55mm selected white float glass disc glued in at > the wide side. One expects that the UV cut version will have the filter > glass there. I guess Vladimir uses one of the clean air pressurised cans > to blow the dust out, you wouldn't like to use 8 bar air with oil mist > for that purpose. I use a very thin brush to clean the inner side of the cone -- works like a charm. I've had bad experience of compressed air in cans: they can spray propellant drops that leave stains behind on optical surfaces. Klaus