![]() This is not the same as true “zoom” lenses: varifocal lenses are designed to be set once at install time, whereas zoom lenses are designed to be operated continually. Generally, a focal length of 2.8mm is wide-angle 4mm is medium 8mm is moderately telephoto (a bit “zoomed in”). Varifocal – These lenses allow you to adjust the field of view at installation time.P-Iris is more sophisticated and will give better results than than DC-Iris, but both are far better than a Fixed-Iris lens, especially for outdoor applications. Auto-iris – This allows the lens to automatically adjust its aperture based on light levels.Usually the manufacturer will specify the maximum useful range of the IR in meters (though this rating is sometimes overly optimistic). IR – Infra-Red – some cameras include IR LEDs (Light Emitting Diodes) for night vision.PoE – Power-over-Ethernet – when using a PoE switch, the camera draws power over the ethernet cable and so doesn’t require a separate power supply – very useful for easy setup.MP – Megapixel resolution – the higher the resolution, the more detailed the image, but resolution isn’t everything: the optical quality of the lens system is also extremely important. ![]() ![]() Some abbreviations used below are as follows: They are listed in no particular order (they are quite varied in terms of cost and feature set, which makes them difficult to rank as a “top 10″ list), however they are all cameras that, due to their impressive features, we recommend to our customers for use with our SecuritySpy CCTV software for the Mac. Here are our network camera picks for 2022.
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