right camera choice - 2.8mm or 4mm lens?

[amilek]

Hi, dear friends.

I want to ask you a question.

I plan to install camera in the corner between walls of main house and garage. The angle is exactly 90 degrees.

The camera I choose: Hikvision DS-2CD1047G2-LUF

FOV:
2.8 mm, horizontal FOV: 96°, vertical FOV: 52°, diagonal FOV: 113°
4 mm, horizontal FOV: 75°, vertical FOV: 40°, diagonal FOV: 89°

I don't buy camera yet, so I need to chose 2.8mm or 4mm.


Alternative: DS-2CD2083G2-IU
FOV:
2.8 mm, horizontal FOV 107°, vertical FOV 57°, diagonal FOV 128°
4 mm, horizontal FOV 87°, vertical FOV 46°, diagonal FOV 105°
6 mm, horizontal FOV 54°, vertical FOV 29°, diagonal FOV 63°

Pro: 8mp
Cons: no ColorVu


My goal in DORI terms: preferrably "Identifification". (maximum distance is about 6 meters)

I already have NVR 7600 series NXI-I, 8 channels with POE.

Please, help me to choose, relying on your experience, right focal distance in 4mp camera or maybe 8mp camera.

With best regards,
Amil

PS. Sorry for non-clear english, it's not my native.

 

[Dan]

Hi @amilek

If you want clear detail up to 6m from the camera then we would probably go with the DS-2CD1047G2-LUF (2.8mm).

 

[amilek]

Hi @amilek

If you want clear detail up to 6m from the camera then we would probably go with the DS-2CD1047G2-LUF (2.8mm).

Hi, Dan.

Thank you very much for quick response and help.

I like DS-2CD1047G2-LUF (2.8mm), but I am afraid that due corner's angle is 90 degrees exactly and DS-2CD1047G2-LUF (2.8mm) has 96 degrees - camera will light walls near it and "overexpose" from this light. Because this concern I also think about DS-2CD1047G2-LUF (4mm), but afraid about too narrrow view of this camera - only 75 degrees, not 90 degrees.

What you think?

 

[Dan]

Hi @amilek

I think the 2.8mm DS-2CD1047G2-LUF will be fine, the overexposure/glare issue is much more of an issue with IR LEDs and also when the camera is pointed more directly towards a wall.

With these cameras using the White Light LEDs and with the walls being at the very edges of the LED field of illumination (where the light will be at its dimmest), I don't think you have to worry too much about light reflecting or overexposing.

 

[amilek]

Hi, @Dan!
Thank you very much for your response. You help me very so much.

WBR, Amil.