Video | Fixed Focal-length Lenses
Fixed Focal-length Lenses
www.boschsecurity.com
u High quality optics
u DC-iris types (direct drive)
u Reliable, robust DC-iris mechanism u 1/3-inch and 1/2-inch formats
u Standard CS-mounts
As CCTV cameras becomes more reliable and maintenance-free through the use of solid-state charge-coupled device (CCD) technology, the lenses also need to have the same high standards of quality and reliability.
The range of Fixed Focal-length Lenses meets these tough requirements by providing long and reliable operation with no maintenance. Comprising DC-IRIS and video-iris types, the lens range from wide-angle to telephoto to cover virtually all applications in CCTV observation systems.
Functions
Designed for easy installation onto a wide variety of CCTV cameras, they are available for cameras with 1/3-in. and 1/2-in. image sensor formats. The extent of the range of lenses means that an installer will always be able to select the most appropriate lens for both camera and application.
DC-iris and video-iris lenses include manual focus adjustment types and can be used in applications with widely varying lighting conditions. These lenses are available with a standard 4-pin connector.
Installation/configuration notes
Choosing the correct lens
There is a simple relationship between the required field of view and the focal length of the lens to be used (see Field of View figure).
To determine this:
•Estimate or measure the maximum width “W” of the field of view.
•Estimate or measure the distance “D” between the camera and the object to be viewed.
•For 1/3 in. lens, use Graph 1 and for 1/2 in. lens use Graph 2. Find the point on the graph for the lens and the sensor format corresponding to the “W” and “D” co-ordinates. To ensure complete coverage of the object, select the lens indicated by the line above this object. Normally, for optimum coverage of the field of view, 1/3 in. and 1/2 in. lens are used with camera heads with 1/3 in. and 1/2 in. format sensors respectively. However, 1/2 in. lens may be used with 1/3 in. cameras but the outer areas of the field of view of the lens will not be seen by the sensor.
2 | Fixed Focal-length Lenses
2 1
4 3
4-pin DC-iris Connector (Front view)
Pin 1: |
Damping coil – |
Pin 2: |
Damping coil + |
Pin 3: Driving coil + (open)
Pin 4: |
Driving coil - |
Field of view
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100 |
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2.8 MM |
3.7 MM 4.0 MM |
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90 |
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80 |
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6.0 MM |
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70 |
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60 |
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8.0 MM |
1 |
50 |
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40 |
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12.0 MM |
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30 |
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20 |
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10 |
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0 |
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0 |
10 |
20 |
30 |
40 50 |
60 |
70 80 90 100 |
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2 |
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Graph 1 – Field of view (1/3-inch cameras)
1Object width (m)
2Object distance (m)
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100 |
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3.7 MM |
6.0 MM |
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90 |
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80 |
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70 |
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60 |
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12 MM |
1 |
50 |
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40 |
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30 |
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20 |
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10 |
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0 |
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0 |
10 |
20 |
30 |
40 |
50 |
60 |
70 |
80 90 100 |
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2 |
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Graph 2 – Field of view (1/2-inch cameras)
1Object width (m)
2Object distance (m)
33.9 |
1.33 |
36.8 |
1.45 |
43.5 |
1.71 |
34 |
1.34 |
36.8 |
1.45 |
43.5 |
1.71 |
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5.6 |
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5.6 |
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.22 |
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.22 |
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36.3 |
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33.8 |
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1.43 |
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1.33 |
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Dimensions LTC 3314/21 LTC 3334/21 & LTC 3344/21 In mm (inch)
Dimensions LTC 3214/20, LTC 3234/20 & LTC 3244/20
In mm (inch)
Ordering information
LTC 3314/21 Fixed Focal-length Lens
1/3-inch, 2.8 mm, direct drive, CS-mount F1.2-100, 4- pin
Order number LTC3314/21
LTC 3334/21 Fixed Focal-length Lens
1/3-inch, 4 mm, direct drive, CS-mount F1.2-100, 4-pin
Order number LTC3334/21
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