Lens fogging on glass and plastic lenses is usually caused by an invisible thin microscopic layer of electrostatically charged particles. This naturally occurring phenomenon is typically worse in dry, dusty, or smoky conditions.
This thin layer of charged particles can also allow fogging on an otherwise properly functioning anti-fog coated plastic or glass lens!
Fogging generally occurs when there is a sudden change in humidity and/or temperature. This is especially true if the lens surfaces have not been properly cleaned.
When the lens surfaces are covered with invisible electrostatically charged particles, they attract water molecules which condense as very small water droplets on the lens surfaces that appear as fog. A Mild Liquid Dish Soap helps dissolve and remove these charged particles.
Lens surfaces –including plastic or glass anti-fog coated lenses– will remain” fog-free” until a new layer of electrostatically charged particles form.
Routine cleaning ORION4-Sight Lenses with liquid dish soap may also help reduce lens scratches, as well as maintain optimum performance of anti-fog, anti-scratch, and anti-reflective coatings, depending upon the specific ORION4Sight style(s).