GE KTC-810C User Manual - Page 12

Additional Adjustments

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Additional Adjustments KTC-510/515/540C/810C/815C/840CE 3 ADDITIONAL ADJUSTMENTS 3.1 BACK FOCUS THUMBWHEEL Back focusing is used to match the lens' back focal length with the camera's imaging device. It enables the camera to be focused correctly during setup and ensures that the image remains sharp and crisp under various lighting conditions, taking into account changes in the lens' depth of field. To achieve correct back focus, adjustments should be made in low light-at night or in simulated low-light conditions. Back focusing should always be done when the depth of field is at its minimum. The lens' depth of field will be reduced when the iris is fully open. (Depth of field: The proportion of the field of view that is in correct focus. Depth of field will decrease when the focal length is long, the f-number is small (iris fully open), or the object distance is short.) To adjust the back focus, perform the following: 1) Operate the camera and view an object approximately 75 feet (23 m) away. 2) If the lens has a focus ring, set it to infinity by turning it fully clockwise as viewed from the front of the camera. 3) If the lens has a manual iris, set the lens iris adjustment to the widest opening or lowest f-number. If the lens has an auto iris, place a filter in front of the lens to simulate low-light conditions and force the iris to open fully. 4) Using the included screwdriver, turn the back focus thumbwheel screw counterclockwise (unlock) so that the back focus thumbwheel turns. (See Figure 1.) 5) Adjust the lens' focal position (with the filter in place, if used) by turning the back focus thumbwheel to achieve the sharpest image. 6) Using the included screwdriver, lock the thumbwheel screw. 7) Position the camera for the required view and, if needed, adjust the focus using only the focus ring on the lens. 8) For optimum performance when using an auto iris lens, adjust the lens level according to the camera's position and environment. (See section 3.2.) 12 1041080A / March 2003

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Additional Adjustments
KTC-510/515/540C/810C/815C/840CE
12
1041080A / March 2003
3
A
DDITIONAL
A
DJUSTMENTS
3.1
B
ACK
F
OCUS
T
HUMBWHEEL
Back focusing is used to match the lens’ back focal length with the
camera’s imaging device. It enables the camera to be focused correctly
during setup and ensures that the image remains sharp and crisp under
various lighting conditions, taking into account changes in the lens’ depth
of field. To achieve correct back focus, adjustments should be made in
low light—at night or in simulated low-light conditions. Back focusing
should always be done when the depth of field is at its minimum. The
lens’ depth of field will be reduced when the iris is fully open. (Depth of
field: The proportion of the field of view that is in correct focus. Depth of
field will decrease when the focal length is long, the f-number is small
(iris fully open), or the object distance is short.)
To adjust the back focus, perform the following:
1)
Operate the camera and view an object approximately 75 feet
(23 m) away.
2)
If the lens has a focus ring, set it to infinity by turning it fully
clockwise as viewed from the front of the camera.
3)
If the lens has a manual iris, set the lens iris adjustment to the
widest opening or lowest f-number.
If the lens has an auto iris, place a filter in front of the lens to
simulate low-light conditions and force the iris to open fully.
4)
Using the included screwdriver, turn the back focus thumbwheel
screw counterclockwise (unlock) so that the back focus
thumbwheel turns. (See Figure 1.)
5)
Adjust the lens’ focal position (with the filter in place, if used) by
turning the back focus thumbwheel to achieve the sharpest image.
6)
Using the included screwdriver, lock the thumbwheel screw.
7)
Position the camera for the required view and, if needed, adjust the
focus using only the focus ring on the lens.
8)
For optimum performance when using an auto iris lens, adjust the
lens level according to the camera’s position and environment.
(See section 3.2.)