A filter or lens surface one should always first free the Lenspen from dust and other dirt particles and then polish the surface with the inspired microfiber cloth carefully. Polished you directly, so there is a risk that the small particles act like sandpaper and the delicate surface damage (also applies to piano lacquer surfaces).
Even drops of water, especially salt water spray, you should of lenses and filters remove as before they dry. Here, the microfiber cloth that could turn a little-quality help.
HAART The Lenspen, even after prolonged use, and not is so compact that it still fits into any camera bag space, but also in the jacket or shirt pocket in two versions. Lenspen and microfibre cloth can thus always carry with you and is therefore always ready for the "First-cleaning tool". For the cleaning of sensors but should as far as possible do not use the Lenspen. This requires special brush, such as from Visible Dust, which is also available on Amazon.
