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The narrow field lens assembly is comprised of two lens barrel halves. The
seam between the two halves may have a gap thru which dust can enter
eventually creating a less than perfect optical system. To prevent dust
entering the lens assembly, separate the lens halves and apply a small bead
of translucent RTV 108 along the seam and press the two lens halves
together. All dust should be cleaned from inside the lens assembly.
Tools:
Screwdriver, Phillips #2
Nut driver, 1/4 inch
Pliers, needle nose
Versilube (06.6027.0001)
RTV, Translucent 108 (06.6007.0001)
Gloves, cotton men’s (06.3011.0001)
Gloves, cotton women’s (06.3011.0002)
Cloth, lint-free
Glass cleaner
To perform dust prevention modification:
Step 1. Remove narrow lens assembly.
Refer to
.
Step 2. At lens assembly, use screwdriver and 1/4 inch nut driver to
remove four 4-40x7/16"PPZ screws and 4-40 HEX nuts, eight #4
SS flat washers, and two #4 .250ODx0.125IDx0.015THK flat
washers if installed (
Note: The reflective heat shield sticker on the small end of the lens barrel
is no longer needed.
Step 3. At small end of lens barrel, remove heat shield sticker.
Step 4. Place lens barrel on workbench and carefully remove one half of
the two lens barrel sections.
Note: Always wear cotton gloves or finger cots when working with lenses.
Step 5. Using cotton gloves, remove each of four lenses. Note location
and direction of lenses.
