11. Maintenance
11.3 Cleaning the lens
To m inimize the possibility of damage to optical coatings, or scratc hes to lens surfaces follow the clean ing
procedure as described h ere precisely.
Necessary tools
• Compressed air.
• Clean Toraysee® cloth or any micro fiber lens cleaning cloth.
• Clean cotton cloth.
Necessary parts
Lens cleaner (e.g. Carl Zeiss lens cleaner or Puras ol® or any water-based lens cleaner)
How to clean the lens?
1. Blow off dus t with clean compressed air (or pressurized air cans
3
).
2. Clean with lens c leaner together with a clean lens cleaning cloth to remove the dust and contam ination. Use bi
g wipes in one
single direction.
Warning: Do not wipe back and forwards across the lens surface as this tends to grind dirt into the coating.
3. Use a dry lens cleaning c loth to remove left liquid or stripes. Polish with s mall circles.
4. If there are still fingerprints on the surface, wipe them off with lens cleaner together with a clean lens cleaning cloth. Polish again
with a dry one.
If smears occur when cleaning lenses, replace the cloth. Smears are the firstindicationofadirtycloth.
3. Pressurized air cans are not efficient if there is too much dust on the surface, the pressure is too low
152 R5905963 PROMETHEUS SERIES 09/03/2015
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