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Portcast technology can add audio and I/O functionality to a camera. It allows for the integration of additional functionalities such as audio inputs and outputs, as well as input/output ports for various sensors and devices. This feature enhances the capabilities of the camera beyond just video recording. This information is corroborated by Axis Communications' technical documentation and product guides.

Closing the aperture at a fixed focal length increases the f-number (aperture value), resulting in a longer depth of field. This means that a greater portion of the scene will be in focus, both in the foreground and background. A higher f-number indicates a smaller aperture, which allows less light to enter the lens but enhances the sharpness and clarity of the image over a larger depth. References: Axis Communications camera optics and image quality documentation.

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OptimizedIR technology in Axis cameras refers to the intelligent adaptation of IR illumination to the camera's field of view. This ensures even illumination across the entire scene, reducing overexposure and underexposure caused by traditional fixed IR lights. The IR LEDs adjust their intensity and spread according to the zoom level and scene requirements, providing optimal image quality in low-light conditions. Axis documentation highlights OptimizedIR as a feature that enhances night-time surveillance by ensuring balanced lighting.

For a 1920x1080 camera, the pixel density at a distance of 3 meters (10 feet) can be calculated using the formula for pixel density (pixels per meter/foot). Given the resolution and distance, the pixel density is 162 pixels per meter (54 pixels per foot). Axis provides guidelines and tools for calculating pixel density to ensure the camera setup meets the required image quality for identification and recognition purposes in their technical resources and planning tools.