Characteristics of parameters of surveillance camera surveillance camera | camera lens optional six elements 
 In order to achieve the desired camera effects, optional lens should focus on six basic 
 A) the size of the subject 
 B) the details of the size of the subject 
 C) the object distance 
 D) Focal length 
 E) the size of the CCD camera target surface 
 F) lens and the resolution of the camera system 
 The calculation of the focal length: lens formula method: the size of the field of view of the field of view and focal length calculation means exposure to objects the size of the field of view is to the intake of the object distance, determined by the lens focal head and the size of the imaging. 1, the lens focal length, field of view and lens to the intake of the object distance is calculated as follows; f = wL / W 2, f = hL / h 
 f; lens focal length 
 w: the width of the image (the subject is in ccd target surface imaging width) 
 W: width of the subject 
 L: is subject to the distance of the lens 
 h: image height of the scene (the subject is in ccd target surface imaging height) field of view (intake) highly 
 H: the height of the subject 
 ccd target surface Size: in mm Specifications 
 Specifications 1/3 1/2 "2/3" 1 " 
 W 4.8 6.4 8.8 12.7 
 H 3.6 4.8 6.6 9.6 
 Intercept adjustment of the lens 
 Intercept adjustment of the lens 
 Using the camera automatic electronic shutter function, to the maximum lens aperture, the lens focus ring to adjust the actual distance by the scene, and then adjust the lens intercept until the clearest images. 
 Adjustment of the zoom after the intercept 
 1 Open the camera automatic electronic shutter function. 
 2 controller to maximum lens aperture. 
 The camera at 30 meters outside the object, focus adjusted to infinity (most of the lens in the face of the surface of the lens focus adjustment ring clockwise rotating head). 
 Controller to adjust the lens zoom to the scene to the farthest, to adjust the lens intercept the scene most clearly. 
 Controller to adjust the lens zoom the scene to pull to the nearest, fine-tune the lens focus to make the scene most clearly. 
 6 Repeat steps 4 to 5 times, until the scene is always clear in the process of lens zoom. 
 Surveillance cameras RS-168EF characteristics: 
 120 meters IR Waterproof Camera 
 4PCS dot matrix LED; protection: IP66 
 1/3 "SONY CCD, 700TV Lines; IR ON 0Lux 
 Built-in CS mount lens 
 The appearance of fine, all-aluminum design, excellent heat 
 Surveillance cameras technical parameters: 
 Imaging Device: 1/3 "SONY CCD 
 Sensing Area: 4.9mm (H) × 3.7mm (V) 
 Image pixels PAL: 500 (H) × 582 (V) NTSC: 510 (H) × 492 (V) 
 TV system: PAL / NTSC 
 Horizontal Resolution: 700TV Lines 
 Minimum Illumination: 0.001Lux/F1.2 (B / W), 0Lux (IR ON) 
 Signal to noise ratio: More than 48dB 
 Auto Electronic Shutter: PAL: 1/50s-1/100, 000s NTSC: 1/60s-1/100, 000s 
 Gamma correction: 0.45 
 Gain Control: Auto 
 White Balance: Auto 
 BLC: Auto 
 Synchronization System: Internal Synchronization 
 The lens mount: Lens: C/CS25mm 
 Video Output: 1.0Vp-p, 75Ω, BNC Connector 
 IR Distance: 120M 
 Of protection: IP66 
 Surveillance cameras power supply: DC 12V ± 10% 
 Current: 70mA (IR ON the MAX 970mA) 
 Operating Temperature: -10 ° C to +50 ° C 
 Size: 180mm × 122mm × 107mm 
 Material: Aluminum alloy 
 Contact: Shenzhen City, South Electronics Co., Ltd. 
 Contact: Liu Kunhua 
 Tel :0755 -27,865,266 
 Phone: 18320895213 
 Toll-free :400 -022-6828 
 URL: http://www.szjrse.com; http:// jrse2012.wjw.cn 
 Address: 71 District of Bao'an District of Shenzhen City stay the fairy all the way on the 14th, Building G on the third floor 
 Characteristics of parameters of surveillance camera surveillance camera | camera lens optional six elements