Manual iris and low-light sensitivity

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The iris is the element of the camera’s lens system that controls the aperture (the adjustable gap in the iris) in order to regulate the amount of light falling on the image sensor. If too much light is permitted to pass through the lens (large aperture), for too long, the result will be an overexposed image. If too little light passes through the lens (small aperture), the image will be underexposed. Video cameras generally have automatic aperture control that continually adjusts to ensure the image is correctly exposed.

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Camera model

Some camera models have a manual override that allows the user to specify the aperture setting. This is sometimes necessary when conducting biomechanical analyses. For example, when a high shutter speed setting is needed in low light conditions, the iris aperture would have to be opened wider than it would be in automatic mode. The drawback of doing this is the increased noise level in the image, which results in a more ‘grainy’ picture.

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Concluding remarks

Video cameras each have a minimum light level that they require in order to produce an image. This level is expressed in lux. A camera with a minimum illumination value of 1 lux will perform better in low light conditions than one with a 3 lux rating.

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