User manual

Maintenance
48 MarathonSeriesFA/FR
10.3CleaningtheLens
Keepthelenscleanatalltimes.Anyforeignmatteronthewindow willaffect1‐colormeasurement
accuracyandmayaffecttwo‐coloraccuracy.However,careshouldbetakenwhencleaningthelens.
Tocleanthewindow,dothefollowing:
1. Lightlyblowofflooseparticleswith“canned”air(used
forcleaningcomputerequipment)or
asmallsqueezebellows(usedforcleaningcameralenses).
2. Gently brush off any remaining particles with a soft camel hair brush or a soft lens tissue
(availablefromcamerasupplystores).
3. Cleanremaining“dirt”usingacottonswab or softlenstissuedampened
indistilledwater.
Donotscratchthesurface.
Forfingerprintsorothergrease,useanyofthefollowing:
• Denaturedalcohol
• Ethanol

Applyoneofthe aboveto the lens. Wipe gently withasoft, cleanclothuntilyouseecolorson the
surface,thenallowtoairdry.Do
notwipethesurfacedry,thismayscratchthesurface.
Ifsilicones(usedinhandcreams)getonthewindow,gentlywipethesurfacewithHexane.Allowto
airdry.

Do not use any ammonia or any cleaners containing ammonia to clean the lens. This
mayresultinpermanentdamagetothelens’surface!