How To Adjust Varifocal Camera Lenses and Get Clear Picture
Specifications
Focal Length
3.5-8mm
6.0-15.0mm
2.8-12.0mm
12.0-30.0mm
5.0-50.0mm
Iris Type
DC-Auto Iris
DC-Auto Iris
DC-Auto Iris
DC-Auto Iris
DC-Auto Iris
Aperture
1.4-close
1.4-close
1.4-close
1.4-close
1.4-close
Mount Type
CS
CS
CS
CS
CS
CCD Format
1/3 Inch
1/3 Inch
1/3 Inch
1/3 Inch
1/3 Inch
ViewAngle(deg)
95-44
54-23
105-40
50-9
63-12
M.O.D.(meter)
0.3
0.3
0.3
0.3
0.3
Dimensions(mm)
38x44x48
38x44x61
44x38x61
35x47x70
50x50x66
Weight(gram)
90
102
110
135
175
Adjustment Of Clear Picture
1. Take off the two plastic covers of the lens and loosing all screws and mount the lens onto the camera.
2. Put the plug into the camera's socket and set the mode on DC for auto-iris type lens. Open the iris to some position for the manual-iris type lens.
3. Firstly zoom the front focal in wide position and adjust the back focal for a clear picture, then zoom the front focal in tele position and re-adjust the bace focal for another clear picture. Secondly, following these steps to get a suitable focus for your desired picture. Finally set the manual iris for a best picture and then tighten all screws.
Cautions
1. Lenses are precise device, do not put it on strong vibration, high temperature and humidity environments.
2. Do not watch at high bright objects such as sun on your eyes in case of injured.
3. Violently operations in screw the lens on or off the camera should be prevented.
4. Do not touch the glass by your finger. In case of this happens, please clean it with soft cloth soaking with a bit of ethanol.
Unshielded Installations 
