StarDot Technologies NetCam SC User Manual page 41

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NetCam SC
the chrome back-focus ring.
Screw the new lens (with attached spacer if the lens is C-Mount)
into the chrome back focus ring on the camera. Continue turning
until the lens is a securely attached.
Monitor the live video either via the analog BNC video output or
with a web browser.
Open the lens iris all the way and adjust the focus ring until you
see a clear image. If it's a varifocal lens, you may need to adjust
the focal length ring (the zoom level).
If you are unable to see a clear image using only the rings on the
lenses, double check if your lens is C or CS-mount. Remember, a
C-mount lens requires a 5mm deep spacer ring between the lens
and the camera. A CS-mount lens does not require a spacer. If you
still cannot achieve a clear focus, you may need to adjust the back
focus ring (steps 7-10).
Use a small Allen or hex wrench to loosen the back focus set screw
on the bottom and/or top of the camera.
While watching the live image turn the entire lens assembly (lens,
optional spacer, and chrome back focus ring) counterclockwise
by 1/2 turn. Make sure the individual iris and focus rings do not
get turned out of position. Focus must be in the infinity position
and the iris all the way open.
Wait a few seconds for the live image to catch up to the focus change
and see if the image gets clearer or blurrier. If it looks sharper,
continue turning in the same direction until you get a rough focus.
If the image looks blurrier, try turning one full turn clockwise.
Focus on something across the room (or in distance outdoors) that
has detail (i.e. lettering, a contrast-heavy pattern, etc.). Once you
get a sharp focus, use the Allen or hex wrench to gently tighten
the back-focus set screw. Do not overtighten.
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