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Pelco Manual C707M-B (11/96) 5
6.0 TRACK ADJUSTMENTS
In order for a zoom lens to hold tracking focus through
the full zoom range, the effective distance from the
banking shoulder of the mounting thread to the image
plane of the camera (faceplate of Vidicon) must be 0.690
inches. This is a screwdriver adjustment on most cam-
eras and is referred to as the “mechanical focus adjust-
ment” (see Figure 3).
If you find that your camera system does not have sharp
focus upon installation, follow these procedures to ad-
just the focus:
1. Select an object as a focusing target at least 75-
100 feet from the camera/lens.
2. Open iris (aperture) to fully “open” position.
3. Zoom lens out to maximum “tele” position, and
adjust lens focus for sharpest picture.
4. Zoom lens back to the “wide” position, and adjust
mechanical focus on the camera for sharpest pic-
ture.
5. Repeat steps 3 and 4 until focus is sharp through
the full zoom range.
7.0 CARE AND MAINTENANCE
Field maintenance of motorized zoom lenses is not rec-
ommended. However, if maintenance or repair should
be required, consult Pelco or a qualified service techni-
cian.
8.0 MODELS
TVJ6AC-1 6X (12.5 to 75 mm), f1.2 mo-
torized zoom lens, 2/3" format,
auto iris and tapered neutral den-
sity spot filter
TVJ6AC-1/LPP Same as TVJAC-1 except with
preset position potentiometers
and tapered neutral density spot
filter
TVJ6MS-1 6X (12.5 to 75 mm), f1.2 mo-
torized zoom lens, 2/3" format,
non-auto iris, with tapered neu-
tral density spot filter
8.1 RECOMMENDED CONTROLS
MLZ6DT Desk top lens control module de-
signed for remote control of
zoom, focus, and iris functions
for motorized zoom lenses.
Speed control is adjustable from
the front panel. This control can
also be used with TVJ6AC-1
lens, however, the iris will not
be controllable. See Figure 1 for
system configurations.
MLZA6DT Desk top zoom lens control with
auto-iris servo circuitry. Pro-
vides auto-iris operation to the
TVJ6MS-1 lens if auto-iris func-
tion with manual override capa-
bility is required. Not for use
with TVJ6AC-1 lens.
Figure 3. Mechanical Focus Adjustment (Product specifications subject to change without notice.)