A 459 nm Faraday anomalous dispersion optical filter(FADOF) working at the side wings of the cesium6S_(1∕2)→ 7P_(1∕2)transition with weak oscillator strength is achieved. The transmittance of the higher side wing reaches 98% at a temperature of 179°C and magnetic field above 323 G. The experimental results coincide with the theoretical predictions in 1982 and 1995, which were not realized in experiments for over three decades. Due to its high transmittance, high accuracy, and narrow linewidth, the 459 nm FADOF can be applied in underwater optical communications, the building of active optical clocks, and laser frequency stabilization in active optical clocks. A 459 nm Faraday anomalous dispersion optical filter (FADOF) working at the side wings of the cesium 6S_ (1/2) → 7P_ (1/2) transition with weak oscillator strength was achieved. The transmittance of the higher side wing reaches 98% at a temperature of 179 ° C and magnetic field above 323 G. The experimental results coincide with the theoretical predictions in 1982 and 1995, which were not realized in experiments for over three decades. Due to its high transmittance, high accuracy, and narrow linewidth, the 459 nm FADOF can be applied in underwater optical communications, the building of active optical clocks, and laser frequency stabilization in active optical clocks.