Selecting a filter with a passband that is too broad can allow more unwanted ambient light to pass through the filter, while selecting a passband that is too narrow can result in loss of a significant portion of the desired illumination and overall darkening of the image. Either can result in a sharp reduction in contrast.

The spectral output from a single color LED light source used in any vision application typically follows a normal Gaussian or “bell shape” profile. The position, height and width of a MidOpt Bandpass Filter passband is designed to emulate this bell-shaped curve, delivering maximum performance.

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