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How wide of an angle?

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  • How wide of an angle?

    The specs don't give the angle of coverage, which is sometime critical to know.

  • #2
    The lens type will give you an indication of the view. Historically they were always 3.6mm. Today you can purchase a fish eye lens (well like the Ring Doorbell), or a variety like 2.1mm, 2.8mm, 3.6mm et al.

    Google CCTV lens to angle of view charts.

    Looking at one HS camera see: Specs

    • Resolution: 1080P (1920 x 1080)
    • Lens: 4mm

    Here is a comparison in pictures as to the difference between a 2.8 mm and a 4 mm lens. FOV (field of vision).

    2.8 mm view

    Click image for larger version

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    4 mm view

    Click image for larger version

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    - Pete

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    • #3
      Thanks, Pete.

      I went through a bunch of this information a couple years ago. I had bought a Q-See camera and was unhappy with the FOV. I ended up ordering about 5 new lenses and replaced the stock lens to get a better view. It was a good experience at the time, but I've more or less forgotten the details. It would be better if the manufacturer just stated the FOV. Most manufacturers claim wide angle, but that can vary from 60 degrees to 130 degrees (examples, not actual numbers) making the wide angle claim useless. I'd just like a stated FOV so I don't have to rely on a verbal claim, and don't have to figure out the calculation myself.

      David

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      • #4
        Yeah here have not tinkered much with my IP cameras having settled on Grandstream a few years back.

        Just starting to look again and started the same way I did way back...purchasing an IP camera board to tinker with...new features now are:

        1 - most are ONVIF (the same now) compatible
        2 - most do H.264 (multiple streams) and JPG captures (but not MJPEG motion)
        3 - optionally now they have cloud services
        4 - free mobile Android or iOS apps for connectivity
        5 - now too they are smart cams and easy to configure.
        6 - you can order them with a variety of lens types
        7 - all of the above now fits on a single 38mm square board. (earlier IP HD cams were 2-3 board set ups).
        8 - you can get 5 megapixel cams now for $50.
        9 - you can get 20 megapixel cams now for $200 (for facial recognition).

        The list goes on and on and I am very impressed with the progress and prices of the new generation of IP HD cameras.
        - Pete

        Auto mator
        Homeseer 3 Pro - 3.0.0.534 (Linux) - Ubuntu 18.04/W7e 64 bit Intel Haswell CPU - Mono 6.00
        Homeseer Zee2 (Lite) - 3.0.0.534 (Linux) - Ubuntu 18.04/W7e - CherryTrail x5-Z8350 BeeLink 4Gb BT3 Pro - Mono 6.00

        X10, UPB, Zigbee, ZWave and Wifi MQTT automation.

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