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Question: I need help to choose an IP camera. I looked at HIKVISION DS-2CD2032-I 3mp lens 4mm.
If someone can post the angle view difference between the DS-2CD2032-I 4mm and one with 3.6mm (DAHUA IPC-HFW2100). I found on youtube a movie with difference between 2.8-3.6-4-6 mm. But the angle view depend also by sensor. I need a video sample from these 2 camera, take from the same position. I want to install this camera in front of a fence with lenght of 12 m and at a distance from 4 m, in the middle. I want to know how much of the fence these camera can see. Thanks.
Answer: The actual FOV will depend on both the sensor and the lens, and one 4mm 1/3" lens will give a different FOV than a 4mm 1/3" lens from a different manufacturer, depending on lens design.
In addition, some cams read each pixel directly at the higher resolutions (like Dahua), while the Hik reads them directly at 1080p and up-samples the 3MP image, so the Hik gives a narrower FOV at 3MP than at 1080p.
I've measured the actual FOV of both the Dahua 2100N and the Hik 2032, and they're virtually identical at maximum resolution, while the Hik gives a wider FOV at 1080p. Measurements I haven't made yet have a ? in the table.
Hikvision DS-2CD2032-I Resolutions:
3MP = 2048 x 1536
1080P = 1920 x 1080
720P = 1280 x 720
OEM 4.0mm lens - Hik's original lens
3MP = 69 degrees H, ? degrees V
1080P = 77 degrees H, ? degrees V
720P = ? degrees H, ? degrees V
Dahua 2100 Resolutions:
1.3MP = 1280 x 960
720P = 1280 x 720
D1 = 704 x 480
OEM 3.6mm lens - Dahua's original lens
1.3MP = 68 degrees H, 50 degrees V
720P = 68 degrees H, 38 degrees V
D1 = 56 degrees H, 38 degrees V
I also measured a Deal Extreme 3.6mm lens on the Dahua (I don't recommend DX lenses on MP cams):
DX 3.6mm lens, from this set:
1.3MP = 75 degrees H, 55 degrees V
720P = 75 degrees H, 40 degrees V
D1 = 61 degrees H, 40 degrees V
If someone can post the angle view difference between the DS-2CD2032-I 4mm and one with 3.6mm (DAHUA IPC-HFW2100). I found on youtube a movie with difference between 2.8-3.6-4-6 mm. But the angle view depend also by sensor. I need a video sample from these 2 camera, take from the same position. I want to install this camera in front of a fence with lenght of 12 m and at a distance from 4 m, in the middle. I want to know how much of the fence these camera can see. Thanks.
Answer: The actual FOV will depend on both the sensor and the lens, and one 4mm 1/3" lens will give a different FOV than a 4mm 1/3" lens from a different manufacturer, depending on lens design.
In addition, some cams read each pixel directly at the higher resolutions (like Dahua), while the Hik reads them directly at 1080p and up-samples the 3MP image, so the Hik gives a narrower FOV at 3MP than at 1080p.
I've measured the actual FOV of both the Dahua 2100N and the Hik 2032, and they're virtually identical at maximum resolution, while the Hik gives a wider FOV at 1080p. Measurements I haven't made yet have a ? in the table.
Hikvision DS-2CD2032-I Resolutions:
3MP = 2048 x 1536
1080P = 1920 x 1080
720P = 1280 x 720
OEM 4.0mm lens - Hik's original lens
3MP = 69 degrees H, ? degrees V
1080P = 77 degrees H, ? degrees V
720P = ? degrees H, ? degrees V
Dahua 2100 Resolutions:
1.3MP = 1280 x 960
720P = 1280 x 720
D1 = 704 x 480
OEM 3.6mm lens - Dahua's original lens
1.3MP = 68 degrees H, 50 degrees V
720P = 68 degrees H, 38 degrees V
D1 = 56 degrees H, 38 degrees V
I also measured a Deal Extreme 3.6mm lens on the Dahua (I don't recommend DX lenses on MP cams):
DX 3.6mm lens, from this set:
1.3MP = 75 degrees H, 55 degrees V
720P = 75 degrees H, 40 degrees V
D1 = 61 degrees H, 40 degrees V