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2.
Remove lens holder. The lens holder, one thick lens spacer, one thin lens spacer, and the
yellow lens will come out as a unit. Hold the lens holder level so spacers and lens do not
fall out.
3.
Remove thick lens spacer (always placed on top of the lens).
4.
Hold lens holder in left hand and a clean sheet of lens tissue flat in right hand. Carefully
turn the lens holder in your left hand upside down onto tissue and lens will drop out onto
lens tissue. When removing lens from holder, stand over a table and keep hands within 3
inches above the table. This will prevent lens damage should the lens fall.
5.
Place lens and tissue in a safe place. Inspect thin lens spacer and clean it with a swab and
lens cleaner. Inspect and clean lens holder.
6.
Put thin lens spacer back into lens holder.
7.
Clean oil off of your fingers using acetone.
8.
Hold lens by edges using lens tissue and thoroughly dust off the lens using a source of oil
free compressed air. A small, hand held, compressed freon duster sold to photographers is
satisfactory. Take caution to hold can upright so liquid propellant does not get on the
optical equipment.
9.
Fold clean lens tissue in fourths, then place lens in between the doubled tissue. Apply lens
cleaning solution #1 to the double thick lens tissue covering the lens using the small plastic
wash bottle. Make sure both top and bottom surfaces of the lens are covered by wetted
tissue. Let it sit for one minute.
10. Final cleaning is done by gently wiping the lens, using several sheets of clean photographic
lens tissue soaked with lens cleaning solution #1. Clean the lens by wiping across the top
of lens, moving in one direction only. After one wipe, use a clean section of tissue and
wipe again. Clean both sides of the lens.
11. Dry optical surface with lens tissue.
OTE:
Never use the same tissue twice. Dust build-up on the previous tissue may scratch
the surface of the lens. Always wipe in one direction when cleaning and use a clean
section of lens tissue with each pass to prevent scratching.
12. Replace focus lens into lens holder ensuring convex(curved) side of lens is facing up away
from thins spacer. See diagram below.
To tell which side is the curved side, fold a clean piece of lens tissue over the lens. Gently
rub the lens between your fore finger and thumb. One can feel the difference in curvature
if the thumb and forefinger are switched back and forth between the sides of the lens.
