Iris work by limiting the amount of light that hits the image sensor. Too much light will wash out your video, and too little light will darken everything, so it’s important to have an Iris that’s especially good for your camera position. Each of the four types of camera Iriss is slightly different, so you can choose the one that works best for you.
Fixed Iris: On a fixed Iris, there is no way to adjust the opening that allows light to enter the camera. This type of Iris is ideal for indoor recordings where the light levels are consistent while the camera is recording, such as offices or schools with many large overhead lights.
Manual Iris: With manual Iris, you can adjust the opening to allow more or less light by physically adjusting the Iris – this adjustment is usually made during installation, when you have easy access to the camera. This type of Iris is usually used in the same way as a fixed Iris, because if the camera is mounted in a hard-to-reach place, it can be difficult to access once mounted.
Auto Iris: Auto irises are motorized, allowing them to automatically adjust the Iris opening based on the changing light of the day. There are two types of auto iris, DC iris (motor controlled in the camera) and video iris (controlled in the lens itself). Because auto iris security cameras use more advanced technology than fixed or manual iris, cameras with auto iris are generally more expensive but are better suited for recording in outdoor locations where it automatically adjusts for changes between sunlight and nighttime.
P Iris: The “P” in P iris stands for “Precise,” as the Iris uses automatic adjustments, such as auto-iris, through controls in the camera software to create improved video clarity and depth of field. There is a limit to how much the iris can be closed, preventing the auto iris from overcorrecting for blurry video that can occur in bright light. Cameras with P Iriss are also more expensive than models with fixed or manual Iriss, but cameras are better for recording in places where the light is constantly changing rapidly
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