A string mounted bow sight for a hunter’s bow comprises a body adapted for attachment to a bow string, the arcuate body comprising a pair of arms symmetrical about a longitudinal axis to define a sighting channel, and a sighting notch extending away from the sighting channel along the longitudinal axis. The container insert is formed as a deformable pouch adapted to be received in an interior of an associated container. In addition, the holder is assembled rigidly and stably, so that the holder will not become loosened during a long-term utilization, thereby facilitating the user using the holder. In order to pronounce the signal with the strongest signal, the weighting coefficients are controlled to maximize the output signal of the adder under the constraint that the sum of the squares of the weighting coefficients is equal to a constant. The light modulators face each other through incident surfaces which the modulated color light components pass through, other than the irradiating surface of the combining optical unit having an upside and bottom and a plurality of sides, and parts of the light modulators are supported by supporting substrates of a plate that are mounted at the upside and bottom.