What does an IR pass filter do in a camera system?

An IR pass filter is specifically designed to allow infrared light to pass through while blocking visible light. This is particularly useful in camera systems that are intended for night vision or low-light imaging, where infrared illumination is often used. By blocking visible light, the IR pass filter ensures that the camera captures only the infrared spectrum, thereby enhancing the detection and clarity of subjects that are outside of the visible range.

This capability is crucial in various applications, such as surveillance and security, where capturing clear images in complete darkness is desired. It helps to reduce visible light interference, allowing for better imaging performance in low-light conditions. The other options, while relevant to camera performance in various ways, do not accurately describe the primary function of an IR pass filter.