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8. Hold the lens assembly by its edge with a lens cleaning tissue and use a drop of lens
cleaning liquid from the little bottle which you received as an accessory delivered with
the laser. While holding the lens on an angle, flush both surfaces of the lens, to wash
away coarse soiling.
9. Put the lens on a clean lens cleaning tissue. Put some lens cleaning liquid on one side
of the lens. Leave the liquid to take effect for approximately one minute and then gently
wipe it away with lens cleaning tissues soaked with lens cleaning liquid.
10. Finally, dry this side of the lens with dry lens cleaning tissues and repeat the cleaning
process on the other side of the lens.
Never use a cleaning tissue twice. Dust accumulated in the cleaning tissue
could scratch the lens surface.
11. Examine the lens. If it is still soiled, repeat the cleaning process until the lens is clean.
12. Carefully insert the lens into the lens holder.
Ensure, that the rounded side (= convex) of the lens is facing upwards.
Then put the O-ring on top of the lens.
13. Carefully assemble the lens in reverse order.