ETC Source Four Zoom, Инструкция по сборке

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25°–50° Lens Tube 19
Cleaning glass lens
Remove dust with a blast of oil-free air or wipe with a clean, lint-free cloth. Isopropyl alcohol, distilled
water or a 50%-50% mixture of each can be used to clean the glass surface.
WARNING:
Do not use ammonia-based or other harsh commercial cleaners. Clean lens
only as directed.
Commercially available glass cleaning agents should be avoided as they may
contain ammonia, other harsh chemical detergents or abrasive agents. These
cleaners may damage the glass surface and the Anti-Reflective coatings. Do
not immerse or soak the glass in any cleaning solution.